I have to say, Eric Gelhaus' threads on what goes thu Gunsite and what breaks give me solid "need" of a secondary/emergency sighting method before I screw on a red dot. Of course as JCN said, slide acceleration/stop/return is a fairly abrupt,violent event.
My take is also based (biased? corrupted?) a bit on shooting apart some fairly decent scopes on heavy recoiling rifles over the years, and watching my Dad do the same.