I guess if you really like the "core aspects" of a genre, then having people come in and write Out Of Genre stuff in them might be annoying ... but you could just not read/watch it :) (and classic space opera was just about dead and needed a change anyway).

I was about to say that I can't think of any comic fantasy long fiction written by women off the top of my head (unless Piers Anthony has something he wants to tell us about ...) but alas! Connie Wills and Diana Wynne Jones make a liar of me ...