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There is 2 square taper standard:
-ISO (njs stuff, campagnolo..)
-JIS (most shimano stuff etc)If your ride heavily an ISO crank on a JIS bottom for years, it's normal that it fail. The square isn't exactly the same, and don't allow the crankarms to go on correctly..
https://sheldonbrown.com/bbtaper.html
Using SG75 BB & Campagnolo BB combinated with SG75 since years without issues
Maybe newest BB are stiffer, but GXP bb aren't revognized for their longevity
Are people really snapping square taper BBs regularly from street riding ?
I've ridden 40,000 plus miles in the last 4 years on square taper without issues, and countless years of mountain biking before that, mainly on square taper, no problem. I also used the shimano hollow tech stuff when it first came out, because it looked flash/new it might have been stiff, but not massively so, the bearing life wasn't great compare to square taper.