it's just pleasing to the ear that way. Try eqing those top frequencies back in and it just doesn't sound nice.
It's quite rare you'd ever have much of that super high top end anyway. I recorded a kit recently with a pair of neumann TLM103s as OHs, and even the cymbals start to tail off over 16khz (not to say they dont have any, and that that region isn't important ofc)