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Squaredisk-
You don’t have to ride far on improperly installed cranks to fuck them up.
The taper gets distorted so they get tightened more but never fit properly so get loose, get tightened more, get loose, get tightened more and then crack. I’d hazard most broken square taper cranks are a result of insufficient torque on installation rather than excessive torque.
dancing james
With square taper cranks I think the issue is many people under torque them. Which is why you get so many fucked nds square taper cranks. “Do it up hard” is very subjective and if using a normal size Allen key a lot of people will struggle to do it tight enough. A torque wrench that does around 50Nm has quite a big lever which indicates it requires a lot of force, try to get the appropriate torque holding it about 8” from the head and you can see why most people don’t get the appropriate tightening on square taper cranks.