Z) Other, housing availability. Can't believe I'm the first to suggest it on page 4!

I) Combat system. Ability countdown number option, a shorter GCD, more off-GCD skills, proc delay and interrupts when you have high latency, animation lock. Lots to improve here, it's not very fluid imo. Also some jobs need more synergy with their own abilities and other jobs.

J) New jobs. Preferably with entirely new mechanics, examples: heals that radiate damage or vice versa, melee healers, melee-caster hybrid job, new types of utility, 2-handed melee dps, class that tames wild animals for pets. I would also love new jobs for existing classes, examples: hunter (bard), berserker (warrior), spiritmender (monk).