After reading through all this, here is the point. EVERYTHING IS A COMPROMISE. I do not doubt that a bulletproof knife can do many things. It also compromises in many areas. Here are a few criteria for a knife.
Weight
Size
Cutting ability
Strength
Edge holding
Ease of use for various tasks
Regardless of the price of the knife, there will be compromises made in every area for gains in another. A "chopper" HAS to weigh more, or else HAS to be longer. It is foolish to say that someone has no sense because they do not wish to compromise on weight. For a knife to cut like a hatchet, it needs to weigh what a hatchet does, or be much longer. That knife compromises it's size, weight, and ease of use in some tasks in order to gain chopping ability.
Many times, two tools can effectively do multiple jobs better than a single tool made to do those jobs. A light knife paired w/ a hatchet/saw/machete will do many jobs much better than an "all in one" tool. This can often come w/ a weight savings as well.
If I knew I would need a prying instrument, or even thought I might, it would for sure not be a knife. If I put something of an edge on one side of a prybar, I would have a prying tool, digging tool, batonning tool, pot hook, etc. And, it would do every one of those jobs better than a large knife. Paired w/ a small, light knife, I would have no troubles. For all these gains, my compromise would be chopping ability.
Pick the compromises you are willing to accept, and get the gains you want.
For me size, weight, and ease of use matter greatly.
If you let testosterone make your choices for you, you stand a greater chance of hurting yourself or hindering your performance when you actually need the tool.
Edited to add: When I say put an edge on a prybar, I mean a small dull bevel, not turning it into a knife.