The main problem is that FFXIV is one type of RPG style, and it seems some people want a different one. FFXIV is more of the "point and click" style of strategy game play, even if using a gamepad. Everything in the fight takes time, and is planned out.
What some seem to want it a more action styled battle system, like Guildwars 2 or Tera. Those types of battles are similar to "point and clicks" but ad a little bit of dynamic evasion to the fights.
Then you have a third type, more along the lines of Phantasy Star Online/Universe or Monster Hunter. These games are pure action, everything in the fight is dynamic and ever changing every second.

The main issue here is that FFXIV is a point and click style, and many want a mic or pure action style, and that is just not what the game is.