Ive played mmorpg games for 15 years primarily as PvP healer/support and participated betas many times. PvE content in FFXIV is fantastic, but as for PvP it lacks a few things:

1. AoE healing in PvP. Current 1-2 uses of Empyrean Rain during entire PvP match are definitely not enough, also 50% heal of entire party is too strong, no healer will wait when entire party drops below 50% hp, which means these 50% are not required at all. Please make use of Empyrean Rain 2 times more often, but make it heal 25-30% hp and remove only 1-2 stuns randomly, not all of them.

2. Rival Wings mode is not working at all atm, and even more it causes troubles like a game bug. Why? Because of that damn 1 hour waiting queue that is excatly as boring as usual game bug. And nobody will wait 1 hour nowadays, people will just leave and go play competitors games. Thats why you should highly increase exp, grand company and gil reward from it depending on the load (if too many players participating atm then reward is be lower, few people join = higher reward). And please point players to Rival Wings more directly by NPC right near the grand company merchant.

3. Current PvP is impossible without high use of complex macros, yes you have good macro system but there is no actual guide on it, I founded required macros only after 1 hour of search in the youtube. Please make more detailed guide on how to make chain PvP macros with <mo> <me> and etc modifiers explained.

4. Raid/Party Frames. Awful. Look at the VuhDo addon at WoW, it is ideal. You dont need to invent perfect frames cause they already exist. Please at least make option to add mouse over actions when you click, right click, and mouse wheel up and down on the party member to heal and debuff spells, 1 spell/macro per each action.