What do you mean? Larian never claimed to offer more then 4 levels during Early Access (or Alpha test or whatever it should be called).
It is not Early Access, like lets say Hades, that will grow and grow until the game wraps up development. It is a testing ground that Larian uses for, well, testing, until they finish working on the game. If Larian will want to test higher levels, then they will add them in. If they feel they don't have a need for that, then most likely they won't.
