I am no expert, but a high gain freak. I also like however versatility, Im not after one sound but all gain sounds and frankly for fun all the clean ranges. I have had every digitech boss korg v amp a bunch of rack stuff, lots of pedals, peavey vypyr tube, zoom's, and to be to the point there is NO comparison, on ANY LEVEL through real speakers, esp frfr.
HOWEVER, I am willing to bet on a recorded track, super high gain, over compressed, over produced, de tuned, buried in the mix , screamo chugathon metalcore, the OP is correct. So if thats all YOU want, recording high gain in a mix stuff, the axe fx is overboard for your needs. There are tons of guys on this board making very cool sounding metalcore sounds but they all sound the same to me, regardless of fas modern left 6 channels of 6150 right and 10 string one finger power chord stuff.
IMHO (but if you wanna sound like srv one day, g lynch, petrucci, vai, andy timmons, or frickin george harrison on other days fuggeddah bout it, keep the axe.)