1. There was a point in time, before crafted equipment gained popularity, people threw in a couple of stats of VIT into the class to make sure they had enough HP to survive mechanics. It would be nice to see SCH actually completely split from ACN, much like DRK, AST and MCH have no class.
2. Always came across as something left over, and ultimately useless, from 1.0.
3. It does rather irk me that these do not fit into key items, despite being bound. We even had 75 spots for key items; I really doubt we'll come anywhere close to 75 key items at this rate.
4. Would also love to see full TP and MP added to the whole wipe or zone into the instance.
5. This would be nice to increase. Not really needed, but would be a nice quality of life change.
6. I don't run into this issue. Well, more like some errors will always show- like completely invalid targets. Skills that can't be used again until a cooldown is up, or anything similar to that, won't give me an error message.
7. I don't see why this needs to be changed for the majority of players. Maybe accessible to new players ASAP, instead of waiting until level 10, while also having checked in with a chocobo porter in a given location previously. Most people will probably stick to their own mounts since many are vanity or achievement statuses.
8. There's no lag. There is animation lock (roughly of 1 second). Nearly every skill has these, but tend to not be noticeable. Most noticeable on HQ and Bene because most people keep these as "oh shit! save me!" tools. It probably does not help the animation is at the beginning and then it's used; most skills are used first, then animation. Bio not tacking on with Fester is something called server tick and you need to compensate for it. There is no reason to "fix" what isn't broken, it's just people not understanding why they are the way they are and calling it broke.
9. Annoying, but it's short. I'm going to guess this has something to do with loading a cutscene, even if you skip it. It'd be nice to be rid of it, but I'm not going to cry over it if it's not. Another nice quality of life change.
10. Never really bothered me since all the friends I have are in my FCs and LSs anyway. If I get zoned in, I have Discord as another means to chat. I could see how this is a pretty annoying issue for others, though.