But if the steel were harder, they could use an even more acute angle without the edges folding. The real issue in the kitchen is the cutting board which folds edges. I know of no blade hardened to 55-56 that could take a whole day of cutting against a cutting board with 15 degree bevels without the edges rolling. Cutting against cutting boards is what chefs do except when paring, filetting, cleaving or boning.
If the meat cutters don't use the knives against a cutting board, then the bevels can be more acute. Different applications. 10 degrees is fine for a razor but not OK for an axe, regardless of the steel.
My point is that the edge should be appropriate for the application and the hardness of the steel. I don't think we really disagree at all.