I totally disagree with most of the assertions made about overseers suddenly returning to Ascension levels of BS. They have a lot more interesting counter play and many, many fair cards that can be beaten by many different decks.
The only cards to watch out for in overseers, in my honest opinion, are Box (primarily because the sacullas interaction can get a bit crazy), and Higher Calling (because that card has always been kind of BS).
The other balance outliers I personally see are Counting The Days (puffy stall) and maybe Tinker for Power, which ik many people disagree with. Other than those things, the game is extremely well balanced, and for the better. Like, I'm fine with Shifting Stone + Pacifying Winds being a psuedo mass death, you do have to dump your hand for that to happen, so it's more comparable to a worse overcharged storm. I think time has proven that the Avatars are quite strong, but not a real balancing issue for now, given that there are sooooooooooooooooooo many ways to deal with them, either for a turn to push through for game, or forever via RFG or Transform mechanics.