It'd be nice if they made brought back Carbuncle auto-attacks, even if you couldn't directly interact with them (maybe these could change depending on the previous summon? Like summoning Garuda-Egi/Emerald Garuda could upgrade the auto-attack to a low-potency AoE like Gust until the next summon).

Elemental summons should cost MP or have a longer cast time, and Enkindle could be made into an ability again which upgrades their signature attacks (and maybe they could rework Burning Strike, Rock Buster, and Aerial Slash so you can choose between different damage types or effects, like maybe Burning Strike now does high single target damage and Aerial Slash does high AoE damage but worse single target damage so you'd prioritise saving Enkindle for Garuda in single target combat and Ifrit during AoE).

Also just bring back old Aetherflow again, it'd make sense if SMN had actual MP requirements again and connects the Arcanist jobs again.