Don't give the guy bad advice if you don't understand WhM that well.

You're technically correct on Esuna to a point. It has a tiny handful of situational uses, like paralyze and a few bosses with lethal DoT's designed to be removed. I'd keep it on your bar. However you could count all these situations on one hand. Most DoT's won't outpace a HoT, they aren't "very powerful", they're just a nuisance. Poison in particular tends to be barely noticeable. Bad healers will Esuna these on sight and think they're being useful, but are in reality wasting GCD's. I very rarely need Esuna.

Cure is rubbish. Really, just forget it exists after lv30 and only use Cure II. Cure II won't eat your MP like crazy, yes this isn't Stormblood, we have more MP management than ever.
Cure II will indeed be your main single target heal (after Tetra, Bene and Regen) until you unlock Solace which is first priority.

Did I mention Cure is bad?

Solace and Rapture may not be oGCD but they're worth 225 potency each (after lv74) and create a weave window (weave windows are very valuable on WhM). They are not like regular GCD heals.

Medica II was not nerfed. It was buffed. The potency was doubled and the duration halved, so the HoT is stronger and condensed. This isn't Stormblood. It's better than Medica in most situations.

Plenary is 200 Potency. The others are 200-300. You mean double (or less), not more. Plenary is great though.

Assize is exactly the same as before. You use it on cd for dps.