[cmyr]

Assuming you're willing to do the same with the nut flush I don't think it's that bad at all. Just calling straight and flush flops with sets is tricky because it tends to kill your implied odds, and unless you're habitually trapping with nut straights and flushes it telegraphs your hand quite often. Obviously mixing it up is important, but as a sort of common line I prefer playing both types of hands fast to playing them both slow.