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I've never seen any proper evidence
I'm not taking a position on this currently.
However: have you seen any attempts to gather evidence?
Cupcakes-
have you seen any attempts to gather evidence?
I doubt whether any sane person would even try. Even if you could decide what "too high" meant (and it must vary between individuals) and gather reliable reports from a large enough population of what gears they had actually used over a relevantly long period, you'd still be left with an insurmountable array of confounding variables.
gbj_tester
Again, citation needed. I've seen that asserted for more than 40 years personally, and nearly 80 years if you count the old blokes telling my teenaged dad that any gear over 84" meant certain knee death. I've never seen any proper evidence that using high gears causes knee injury.