What I would change, If I could choose

- Every summon become OGCD, every summon would trigger ruin 4 instant cast

- bring back tri disaster and two dots

- Remove all basic gem attacks and bring back 2,5sec ruin 3 cast as basic filler. Just keep special gem attacks, but change all of them to become ogcd. Garuda have one strong aoe dot, titan have one strong initial attack, ifrit gap closer

- Second set of gem attacks could be different than first set, bring us ramuh, shiva leviathan or something else.

- Bring back Aetherflow like how it was during during Stormblood, but if you use it outside of combat, it would automatically reset cooldown.