For geometry, fixed-precision integers are better. But for computation and usability, floats are great. Scaling a 10 meter model in floats to 13% of the size is a trivial multiplication by 0.13f. With integers, this can get tricky. Can't first divide by 100 then multiply by 13 because you'd lose precision. Also can't multiply by 13 and then divide by 100 because you might overflow. Unless maybe venders would add hardware that computes that more accurately like they currently do for float, but honestly, float is good enough and the the potential benefits do not outweigh the disadvantages.

Float is also fantastic for depth values precisely because they have more precision towards the origin, basically quasi-logarithmic precision. Having double the precision at half the distance is A+. At least if you're writing software rasterizers and do linear depth. The story with depth buffer precision in GPU pipelines with normalized depth and and hyperbolic distribution is...sad.