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I find they slip in bolts more easily. They probably do some damage when they slip so for me, ball ends are not for torque.
Edit: possibly depends on the quality of the Allen wrench in question. It’s probably entirely possible to get ball ended ones that won’t be anymore likely to slip but ime they slip more than straight ones.
Out maybe the ball shape allows a bit of ‘torque out’?
M_V
What's wrong with ball-end?