Breaking mounts happens......something has to give. but have you ever broke a bed plate with one??
I have been using Monkey Grips for years. Yes, they break! I consider mounts a sacraficial wear part.
I routinely change out my mounts, begining of the season, then again mid summer as part of routine maint.
If you ride hard, you kind of have to expect it. Best advice is keep several new ones as spares, check them at the end of every ride. Find a broken one? Change it right away!
I agree, side slapping hard from a failed roll is probably the worst, followed closely by pancaking a failed surf flip