Warlock patrons punishing you is largely irrelevant when you can just respec into a Sorcerer at will.
The same is true for paladins, but the falling mechanic is still in the game.
The patrons casually showing up at camp can create some odd scenarios, too. If Mizora wants Karlach dead, why doesn't she just kill her herself given the chance? Or are we supposed to believe a greater devil is afraid of a level 4 Barbarian because she's a legendary infernal general badass? Maybe we can stack up some barrels and just blow Mizora up, and Larian will have some elaborate contingency plan for that, too?
That's an issue for the writers to resolve. I think it's very likely that Mizora will show up at camp though.
The patrons are supposed to be very powerful beings. To be able to grant Pact powers, Mizora is supposed to be on an (almost) Archdevil level, i.e. Asmodeus, Mephistopheles, godlike from a low level mortal view. I wish they kept the pact a bit more mysterious and abstract than a conversation at camp. A personal secretive connection between the Warlock and the patron. Making the patrons mundane like that won't help making Warlocks cool.
Not necessarily god-like though. There is no rule that specifies how much power a warlock patron must have, and I have seen unicorn and couatl patrons in PnP. Mizora was captured by goblins in EA, I don't think that puts her at arch devil power!
I'm guessing Archfey will tie in with the Hags of BG3. Could be Auntie Ethel's boss.
It's hinted that Auntie Ethel is much more powerful than an average hag (and aint really dead). The text for the Fathomless warlock patron (Tasha's) mentions "sea-hag covens" as potential patrons, opening up the possibility of multiple individuals being a single patron.
