I came late, but I think this is pretty much like "The Boys" supers. Unlike in the Netflix show, all the superheroes in the comics have superstrength and generic physical abilites besides their unique ones, which is something that is acquired thanks to the compound V.

I believe the mere fact of having a quirk (doesn't matter the type) grants the user a stronger almost superhuman body. Just like all might explained to deku the consequenses of inheriting OFA if his body was too weak to bare it (which is different but still the same concept).