I decided to go through to see which classes are the most affected by this right now.
Fighter: Doesn't have combo ring yet due to no dual saber, so needs to ring swap for Twin Dagger usage and Knuckle usage. Rather annoying.
Bouncer: There are 2 Dual Blade rings and you want both. Very, VERY brutal for bouncer as you can't use shortcuts to ringswap - you're literally having to pick 1 or the other for your dual blade rings.
Gunner: If you aren't using Front Stylish Roll (or the combo ring) then you aren't playing gunner right. 99% of your chain combos don't work well without it. This renders TMG Stance Up completely ineffective and impossible to use.
Ranger: Has to ring swap for launcher and rifle. Launcher Non-Weak Bonus gives launcher way better damage consistently, Precision Blight Rounds is basically needed to land your weak bullets in the right spot.
Outside of that, I don't think most of the other classes are missing that much out of it, summoner definitely isn't... but there are rings that almost everyone uses.
Everyone: Everyone could use Atomizer Fanatics -- Techter even moreso than others for the obvious reasons of rebirth bonus. Atomizer Lovers speeds up the usage of atomizers AND gives you iframes while you're using it, so it's not a process of "use moon, oh i guess i'm dead now instead". Star Atomizers are also amazing... But overall the ability to actually use moon atomizers safely without doing ring swaps is massive, it gives a lot more incentive for people to revive others.
Also, a lot of people end up using Leaping Dodge a lot from my experience. So there's that.