Serious suggestion only please
Changes I'd personally like to see are:
1. Traits that change Fire 2 into Flare and Blizzard 2 into Freeze. At certain levels those spells aren't even used anymore, but we can't take them off our hotbars because we need them for low level content.
2. Removal of Fluid Aura. It's useless and a waste of hotbar space. Other healers don't have a bind, so SE clearly doesn't even believe they need it.
3. Switch the cast time of Scatter/Impact with Veraero 2 and Verthunder 2. Having RDM's AOE rotation flipped from the single target rotation can get confusing. Switching the cast times will match both rotations and line Jolt > Veraero/Verthunder up with Impact > Veraero 2/Verthunder 2.
4. Remove gauge costs for Onslaught, Hissatsu: Gyoten, and Hissatsu: Yaten. No other tanks or DPS jobs require gauge for their tackles or disengagement skills, so it's silly that WAR and SAM do. WAR and SAM can't even use them without screwing up their rotations and losing overall damage because they need their gauge for other skills.
5. A skill like Bane for BRD, please. It's such a pain to apply 2 DOTs to every single enemy in a pull to increase our song stacks faster and do more damage overall, and it's an ability we've wanted for a long time.