If we're going to throw out nonsensical suggestions:
Ban recovery. All of it. Leech Seed, gone. Strength Sap, gone. Leftovers, gone. Poison Heal, gone. Water Absorb, gone. Regenerator, gone. Needless to say, straightforward moves like Rest and Recover, gone.
Embrace the HO that GameFreak has given us.
Or...we can accept that we're an unofficial metagame, based on a game that is (theoretically) balanced around a 4v4 doubles format, trying to shoehorn everything into a 6v6 singles format. The only singles format that GameFreak cares about is BSS, not the one that comprises nearly every in-game battle.
If GameFreak hands us a bunch of insanely powerful offensive mons (and they have), we have two choices: ban a bunch of stuff to recreate a "preferred" metagame, or deal with it and accept that Gen 9 is going to skew offensive. Smogon policy holds that the metagame should allow different styles to all be playable, it does not hold that any given style is 'bad' and some other (usually a flavor of balance, varies with the complainer) is 'good'.
There's a point where an offensive mon is too good and stifles another style entirely - this was Annihilape's crime - and then of course, we ban them. General "make the meta less offensive" is not grounds to ban anything.