To what extent can normal magic and other attacks do to a Curse User?

I know that trace magic in basic attacks can help damage curse users, and since magic is, well, magic, it can do a lot more. When a curse user morphs into their respective element, does it become more like a logia from One Piece where they can’t take physical damage without being restrained by those cuffs the navy has? And since they can dodge attacks this way, can some curse users not even be damaged by normal attacks like punches and stabs and stuff like that?