I think "solo buffs" is pretty much exactly how it should go. I can't speak for modern WoW, but in older editions of WoW that's pretty much how it worked - you maybe had Bloodlust as a once per fight raidwide buff but otherwise everyone was on their own. When you triggered your class's big damage buttons was in large part reliant on when it was safe and effective for *you* to do so.

I also liked how planning on how to integrate your personal rotation into the raid's buffs and rotation worked in Shadowbringers, although we were already well on our way to the 2 minute meta there. I think there's a lot more space to improve skill ceilings in an "everyone is on their own" setup than a rigid 2 minute hierarchy. Add this to making boss hitboxes a bit smaller so that melee and tanks have room for greeding mechanics (damage down is a good solution to lmao healers adjust, it should remain as is), and I think you're in a much better place going into Expansion Number Next.