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@Momentum
The other reason is that a track end lets you get the wheel closer to the seat tube for a shorter wheelbase, which qgives quicker handling and is more aerodynamic. The latter reason is why some TT bikes still use short trackends instead of vertical dropouts.
I've never really thought the "wheel slipping out of the dropout" argument stacks up. If your awesome power does move the wheel then it will jam on the chainstay, especially on a track bike with round chainstays (insetad of oval) and tight clearances. You'd have to set the wheel up pretty stupidly in a horizontal dropout to let it pull out completely.