The auto-battle gimmick.
I personally don't have THAT big of an issue with the auto-battle gimmick: I'm kind of cool with it. If I noticed correctly, he doesn't use skill points when auto-attacking, so that's probably a price to play for not being SP hungry. The fact that you can't direct his attacks (though it does seem he prioritizes the enemy at the center of the enemy field) does seem troublesome, but again-- a price to pay.
HOWEVER, my issue lies with the possibility him being a slave for a certain Castor Oil. Not necessarily as a sub-DPS, but as an enabler(? If that makes sense. Please don't hurt me, Mydei's biceps around my neck cut off oxygen to my brain), much like how Acheron needs nihility characters or THEE Herta needing an extra Erudition teammate. I fear they'll make him into an brain dead HP burning battery that doesn't need maneuvering for a Clitoris gimmick so you can focus your attention only on her (the lack of oxygen is making me delusional).
Also, don't get me wrong. I don't hate Clitoris (until Hoyo forces me to 4 dates with her.) I just love My-tiddei too much to let him be degraded into some kind of side-beach character for a (potential) waifu™.
Honestly, I highly doubt they'll remove the gimmick but I also can't think a solution that can make it more attractive to play around.