Full flat blades require a full grind to the top - expensive in a market popularized by the macho looks of saber ground or the custom hollow ground. Actually the less grinding done the cheaper. Check the really inexpensive imports and you will see just the edge ground on a blade with parallel flats, which is about as cheap as you can get.
I no longer see the point of a hollow ground or sabre ground blades "being stronger," as I prefer knives, not prybars. Full flat grinds offer less resistance when cutting, as the material being cut, especially stiffer items like cardboard, will pinch at the grind line and create friction. Full flat grinds do not have a full thickness section to bind. It's a matter of degree, but that's what is discussed here.
Choils take time and effort to put them into the design. They often don't put a finger any closer to the blade than other types which are fully edged right to the grip with almost no relief. Using a choil implies a delicate cutting task requiring precision control, not forceful hacking, so I don't see any danger to a knowledgeable user. The blade does need a sharp tip section to take advantage of it - leaving out thick grinds. Also the inclusion of a choil implies that the loss of an inch or so of edge near the handle will be made up in the ability to do fine cutting tasks, as opposed to wide slicing.
I have a folder with double choils, one on the grip, one on the blade, in a flat ground drop point. This style is often seen in knives marketed to utility and hunting, as the flat grind and choils contribute to small clean cuts, as in dressing out game or woodcraft. It's proving itself capable of a wide variety of cutting tasks - which is what a knife is supposed to do. Along with including useful design features in the S30V blade, as opposed to bling grinds with excess edge or even serrations, this knife is a titanium and G10 framelock which is far more reliable than most linerlocks I've owned. Which is why it's so frequently compared to Chris Reeves' Sebenza - it's a great utility design for EDC. Why some people can't see beyond the name to understand the knife reveals more about them than their objections - full flat grinds are a superior way to make blades, choils are a conscious choice to cut rather than hack and let the guard guide the blade. Both together sell to mature users with experience who choose function over form - which obviously doesn't describe today's knife market.
