Jobs should have more variety in simple vs complicated, It's fine to have Jobs that are easier to play it's fine to have Jobs that are harder to play, I think the issue is that being "busy" doesn't mean difficulty when a lot Jobs designs are needlessly busy in the 120 minute windows, but outside of that they're just pressing a 1, 2, 3 filler.
I even think variety extends beyond rotations, I don't think Jobs should just only serve a purpose of being there to bring a slightly different rotation and cosmetic look, at least I would enjoy something that brings new options or something else.. But It feels like even expecting a Job with at least a nice rotation feels like I'm expecting too much. Raid buffs aren't even interesting you just click this 120 buff and yay. I don't think the current raid buff system works in favour of making jobs stand out unless they're Bard, Dragoon, dancer or Astro.
With Tanks & Healers, They should all stand out with utility kits especially, It's sort of there? (like some small differences?) but I feel like 7.0 will likely make things even closer then they are.. Paladin/Dark knight will likely be more inline with the other tanks in kit (Which some aspects of their kits such as Cover on PLD I don't mind changing), While something like Astro I', genuinely worried if it will be reworked into something that's easier I love Astro it's the only healer I like to play in casual content. Because it stands out, it feel active.
What I want is More interactive gameplay, Paladin for example should have more ways to interact with it's gauge, I hope healers like white mage have I don't know more damage buttons or something? Melee DPS should get a semi "support", Raid buffs should be more Unique to jobs instead of this boring ability you press every 2 minutes... Jobs in general should have some skill to learn while being welcoming to new players, I don't want to be afraid of balance changes or some forms of making a job more balanced, but balancing to ruin the purpose of a job and just making it like every other makes the job feel pointless to me.