When your gigging day after day 4 hr shows etc,etc,or playing alot at home day after day..weighted keys can take a big toll on your fingers, wrists, hands after time for sure, carpal tunnel, arthritis, etc,..
But Donny, if that were true, wouldn't it affect professional pianists? I don't recall this being a problem with the ones I know (who play frequently and exclusively piano their entire lives). Just sayin'. BTW, if you live long enough, you're going to get arthritis anyway, even if you've never seen a keyboard. Also, I've got arthritis in every joint in my body EXCEPT my fingers; I attribute that to daily exercise my fingers get playing keyboards, including piano.
chas