I have refused an a/c with antiskid u/s despite pressure from both engineering and operations. The airport had a relatively short runway and a drop of eighty feet if you overran!
I was totally backed by the fleet manager.
I think it's in the MEL to get you somewhere it can be fixed - not to continue carrying passengers as if there's nothing wrong. Given long runways and no 'aircraft carrier' like runoffs I might be flexible for a few sectors.
Antiskid u/s is not allowable on wet runways here.