RCs and supers are still used in AC and +R despite the number of 25 meter options available, because the 25 meter options do not cover all of the scenarios you want. Yes, FRCs and FBs are more cost effective than RCs and Supers in those games, so you see them far more frequently, but that is a balancing issue with the movesets (and maybe the FRC mechanic in comparison to RC's limitations) rather than varying levels of meter options. Rather than seeing the meter management decision between half on getting in or half on combos, the 25 meter options provide more alternatives to the situation, which makes it more fun imo.