The meta in cEDH is better than it has ever been. You have combat combos (Najeela, Godo), One card plus commander wincons (Divergent transformations, polytyrant, omenpool), many non blue fast combo decks (Mardu farm, korvold foodchain), Stax decks (Winota, double tymna etc), Ranimator decks (kenrith, anje), Midrange control / value (kess, T&T), then of course the fast blue decks.
cEDH is just fine, almost all ways of winning the game have a viable option on the DDB.
Yes, OK, many of the blue combo and control decks use consult lines, but so what? The fun in cEDH is getting to the point where you can pull the trigger, not fussing over the wincon......
And for casual EDH, the answer is simple, balance the decks before the game.
Ban nothing. The conversation should be about unbanning things like paradox engine to put more commanders back in the meta, not taking away options from people.