the fenders wont sag, but it is a bit unsafe especially for jumping.
on a dirt bike you have nothing behind your feet but on a quad you've the axle and wheels
if you're gonna ditch them i'd recommend a set of good mx boots or taking a grinder to the stock pegs to sharpen the teeth.
i learned the hard way that it's better to have some type of heel guard, came off doing a wheelie and ruined a brand new set of mx boots off what i can only guess was the rear sprocket, lesson learned full nerfs for me
opinions will differ but they're your legs
jamie