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Just to add some food for thought. You could have a wedge razor with half the spine thickness as a full hollow (assuming the same width) but the wedge still wouldn't really flex anywhere near as much...

There's just less supporting material behind the edge bevel so you get that high flexibility although it isn't true that you don't get flex on a wedge.

When I make my own razors, most of which...

Apex width would be identical given the same angle and other properties beside the grinding. You're overthinking it imo, mass, flexibility, all that stuff is irrelevant to angle and incidentally apex...