Boring design

[Absurdity]

I mean there is a lot to be said about how visually impactful your rotation feels and tanks do this infinitely better than healers and they retain alot of their DPS complexity while also getting quite good upgrades (I hate the short CD’s for what they did to tank healer balance but damn do they feel impactful when you use them) that fill gaps in their kits, healers continue to get more of what they don’t need

Tanks certainly aren’t flawless but you just have to look at the job action trailer to see, tanks get a new 1-2-3 upgrade or an AOE version of one of their best abilities and healers get medica 3

The big question is, how does that actually change gameplay?
We don't know yet but for the examples you listed I'd argue there is no difference between getting a flashier version of your filler and medica 3, neither changes how the job plays, one just "looks" fancier.

Healers will still never use their new ability and tanks will still spam the same filler between bursts.

Just think of this. A lot of people have been asking for PvP combos on jobs like tanks, making their 1-2-3 filler into a single button. If that happens you're suddenly looking at tanks also just spamming the same button for something like 60% of a fight, sounds familiar.
A lot of the gameplay difference is nothing but smoke and mirrors to make you think you're getting more interesting gameplay than you actually do.

Granted I am taking the most uncharitable interpretation of upgraded 1-2-3 here.