Maybe minute-of-pie-plate hunters popping does under a feeder that have been using the same 5 boxes of Core-Lokts they bought at K-Mart in 1994 can get away with that, but knowing temp stability of a powder to avoid checking zero is not a serious argument.
I agree, if 200 more FPS is just non-negotiable and absolutely critical to a shot, then step up the case to get it instead of pushing something outside it's envelope. Why overpressure the heck out of a 300 WM when there are a half dozen 30 cal options that could hit that speed without pushing the case past the point of sanity.
Seems like the more casual side of this sport is stuck in the "faster is better" magnum mentality. Putting something smaller and slower through the boiler room is always better than missing, no matter how fast the bullet you missed with was going.