Funny how many people are against changes that make sense + playing experience easier. Sure, you can get anywhere in New York by walking (and some would argue it's good workout for your health), but me personally, not being masochistic if only possible, would use metro to get from 1 end to the other. Dear SE, cater for sane people, not masochists, please.
I think I wrote somewhere sometime on these forums my issues with game's GUI already (pretty much similar to Byrth's), but to reiterate and expand:
Losing lock on monster after gear swap JA/magic (try playing THF and running around monster in circles for SA/TA/WS for several minutes, it hurts THF's DPS alot)
Collision lock with other players/monsters - every time you bump on a player/monster you are stopped in your tracks for ~1s. What's the point if then you are allowed to pass through them anyway? To say your greetings to each others? Makes no sense. And it's a real hindrance when you're in Port Jeuno, it's Saturday JP time and you're trying to get in your Mog House, or when you're kiting something (let's say King Behemoth back in the days, I know that area is huge, but as an example, if you had 200 people against you, they could MPK you with collision lock) and people get in your way (on purpose or even not on purpose).
Losing Reraise status when DC and you are subsequently killed by whatever you were fighting - not a major issue, but still. My friend was soloing Dynamis yesterday (he missed our scheduled run, so had to solo) and his game crashed; he logged back and was dead without Reraise. Having all your friends unable to come and raise and having everyone in zone too busy with their timed event's tasks (or unwilling to help competition), your only option is Home Point.
Unable to /search when dead - why is it that when you are dead you are not even alowed to search around for people who could raise you? You are unable to /shout for your own raise either. But you are still able to send /tell Anyone sees inconsistency and bad game design in this logic?
Also, in before PS2 limitations / spaghetti code / we-are-too-busy-adding-new-job-emotes-to-fix-this-for-you-so-U-mad?