Asserting things does not make them so. I could say "an extra 10-20 innings per year is very unlikely to, in and of itself, cause a significant problem". Besides, shouldn't it be the number of pitches? There is no known bright line here between a "safe" number of pitches and an "unsafe" number of pitches. Throwing over 100 pitches does not equal abuse. If limiting starters to 100 pitches is safer, all else being equal, than letting them go 120, then it is likely that limiting them to 80 would be safer than 100...so why not do that? How do you know that the risk is worth the reward if he goes 100 rather than 80, but that in the case of letting him go 120 rather than 100 the risk is not worth the reward?