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I don't understand why people even appear in these kinds of threads, wanting to redo everything, swap creatures around, and make other major changes... Let's be honest, the author didn't just pull this out of thin air and didn't spend only 5 minutes thinking about it. They considered many things (even if not everything), and that's why we were asked to discuss it. Moreover, there are actually two authors. Removing the Ettins, in my opinion, is stupid; it's one of the main (in my view) highlights of the creatures, and they really impressed me.
You're suggesting replacing this level 4 with some hermit mages, and it seems you haven't even bothered to read the previous posts. Otherwise, you would understand that there's not much point in your post, because something similar already exists (albeit in a different variation).
And Warlocks already exist; they are the Elves, so calling creatures/heroes of the new Nighon that would be, to put it mildly, unfair.