Multihit weapons are a developmental headache. The game ends up being more impotent when they have to be accounted for than if they never existed, just as the stat system has to cover players boosting their str to 200 and make str worthless, so would a system have to cover players attacking multiple times or stacking players that can attack multiple times.

Better to just design a good solid system and not try to epeen it up with fad and OMGBBQ features just for the elite and fanservice.

Weapons shouldn't have differing numbers of hits. Materia should offer all weapons that feature.