The question of physical types and their influence on the development of arms and fighting techniques is part of a larger issue which, I believe, holds the key to understanding what ancient & medieval warfare was all about. This is long-winded, but it gets there in the end; and I think it's essential to bear these matters in mind in any discussion of ancient weapons and their use.
Basically, it comes down to objectives and agendas; when our ancestors went out to fight, what were they seeking to achieve?
Ask a modern soldier that, his answer will come reflexively; seek out and destroy the enemy. But that, I believe, wasnt how most ancient fighters thought. They had a very different mindset, which we find hard to relate to.
We regard war as a bad thing, something to avoid, something to get over & done with as quickly as possible. Thats because we have a total-war mindset. In antiquity, however, nations were often almost constantly at war; and war was *not* total. As late as the 16th century, one of Shakespeares characters, remonstrating with somebody with nothing to do, says Are there not wars? Is there not employment?. In antiquity, war was always there, but always in the background. For one thing, war followed the agricultural calendar. People went to the wars during the off season (what the Romans called the campaigning season; the Norsemen were the same, only going i viking when there was nothing to do on the farm), and came home to plough, plant and reap. With few exceptions, there were no professional or standing armies; soldiers were first and foremost farmers, and understood the priorities.
The ways of making war were also designed and rigidly controlled by the rich, the ruling classes; this control of the ability to make war was precisely how they maintained power. As early as the Lelantine War, in the 7th century BC, (described by scholars as the first world war), the opposing sides agreed an arms limitation treaty - not to use spears, arrows or slings, because with these weapons, a peasant could kill a nobleman, and that would be completely unacceptable. Classical Greek warfare was refined down into, literally, a test of physical strength, a shoving match like a football scrum. The objective was to make the other side run away; *not* to kill them - they were, after all, also noblemen, and quite possibly related to you by blood or marriage. Similar rules prevailed in parallel cultures - for example in southern Africa before Shaka, where warfare consisted of throwing spears at extreme range (thereby minimising casualties) until one side lost its nerve and ran.
War was a chance for the young nobleman to prove his worth; both as an individual, compared with other nobles, and as a member of the ruling class, as against the commoners. Medieval knights wore impenetrable armor, and knew they wouldnt be killed if they lost - they were too valuable, since if they were captured, their families would pay huge ransoms for their safe return. Ancient societies tended to think not in terms of good/bad but of honor/shame; and war was where honor was earned. More than that, it was the *main* way of achieving these objectives, of earning and proving honor and worth; in some cases the *only* way.
In consequence, a warriors weapons were designed not only to cut and pierce, but to show class and display wealth; likewise armor. Ever since that primeval ban on arrows and javelins, aristocratic warriors (except, for some reason, in India) spurned projectile weapons as immoral (because they proved nothing; a poor weakling could shoot a rich champion in the back...) and poured their wealth into expensive, impressive swords, spears, axes. In a society where all metal was precious and rare, a mailshirt was the equivalent of a Lear jet; the ultimate status symbol. Accordingly, arms and armor developed not necessarily because they were efficient tools for killing and defence, but because they were impressive, they showed class. Ancient Greece restricted participation in war to the rich by specifying solid bronze plate armour. In classical Greek cities, social classes were divided up purely on the basis of wealth; if you could afford armor, you could vote, if you could afford a horse, you counted as nobility. By this means, all power, political and military, was kept out of the hands of the lower classes (a misleading term in a world where urban proletariats were few and far between)
Physical type and physical strength depend to a large degree on nutrition. The people who fought in antiquity were by definition well nourished; they were the rich, after all. Accordingly, ancient warfare was designed to favor the physically strong. Strength was a sign of worth. Swords, in consequence, became longer and heavier; armour became more bulky and massive.
The poor bloody infantry, meanwhile, the peasant levies called up to follow their lords into battle; why were they there at all, when their contribution, as light infantry, was devalued and unimportant. Quite simply; they werent there to participate (except as cannon-fodder, easy targets for the chariots and the armored knights to score points on); they were there to *watch*, to see their lords in action, to be impressed; to take home stories of how brave, strong and invincible the noblemen were - with the implication that trying to change the status quo or get rid of these invincible nobles was a very bad idea. The Great King of Persia invaded Greece with a vast army, far larger than was needed, drawn from every part of his empire; the idea was so that everybody in the empire, from Turkey to India, would be made very much aware of how mighty the King was. When the plan backfired and a few miserable Greeks beat the Persians, the result was serious uprisings in many provinces of the empire; the lesson was learned, but it was the wrong lesson...
When these rules were broken, which was rarely, the world changed. The Athenian empire was broken when Gylippus of Sparta used bowmen and javelin-throwers to wipe out a huge Athenian army of warrior-gentlemen. The Roman general Marius, for political rather than military reasons, recruited a professional standing army from the urban poor, which ultimately went on to conquer the known world because it was trained to seek out and destroy enemies who were still playing by the old rules. The English cheated at Crecy and Agincourt by letting peasants with bows slaughter the flower of the French nobility, something which was so unspeakably alien to the French that they could hardly believe it. Shaka, prince of the insignificant Zulu tribe, conquered a vast empire in southern Africa simply by arming his men with stabbing spears and telling them to get in close and kill.
But these were exceptions to the rule; which was, that war is about gaining honor, not about killing; and that the trappings of war were governed by the same agenda.