You could say that about any feature that UE4 does not have and you need to write your own, like Inventory system (which btw, been part of the engine in the past since beginning). If you want make your game mod friendly, if this is so impotent for you, why you need to wait for Epic to do things for you?
I notice that there some strange problems in this community, that strange mentality of building game starting from above instead from ground, thinking that somebody need to do things for you. Mentality of locking themselves in the virtual cage of others (which is opened btw), then wondering why there are sitting there and why they can’t do things in it. With this kind of mentality, modding would not be even created… bah games would not be created. So i don’t know how you can be good game developer with such mentality. If you lack abilities then find somebody with them… or continue waiting for Epic to do something if anything. iOS is known to have the thoroughest software restrictions, even thru developers complaining, it does not stop them to find even craziest work arounds to withstand those restrictions… here most of things you got open and not much of restriction, yet it some developers seem to be paralyzed.
And again if users whats to mod your game so badly then they always find a way to do so… even without paying 19$ for editor, there many examples of games which developer didn’t think about modding abilities, yet community can rip that game in pieces, even components that does not suppose to be editable. First mods been done on games which didn’t have mod support at all as developers didn’t had that idea at all, mods been created by gamers.