Most of my problems involve leveling, in most mmo's I have played I enjoy leveling to the exclusion of almost every other part of the game. But with so few options in this game for leveling mostly dungeons, bozja and, tribal quests I feel like theirs a real lack of world content or lets call it more relaxed leveling content that doesn't require a que.
I feel that the FATE system and Hunting logs massively underutilized by the developers as a fun way to create more interesting and varied leveling experience. I don't think FATES should offer as much or more then dungeons for example maybe 10-20% less on average (they may do this already I don't know). I would like to see more variety in the FATES as well as all we seem to have is kill x number of monsters, kill mini boss, or collect items for turn in... by killing monsters. Things like Group fates similar to bozja field bosses as well as escort missions or offensive missions to destroy an objective or more interesting defensive missions then the ones we currently have. They could also scale in difficulty based on the number of players so the time to complete could be relatively constant with 1 or 8 or 40 people.
I think the solo hunts could be expanded as well by making the hunts more rewarding.
but also making the monsters feel intriesting. For example a way this could work is the hunt bill sends you to a location where you wait and a monster shows up but its a mini boss with some simple avoidable mechanics.
I also think it would be nice to see ways implemented to level jobs we don't want to have to play too much (I know we all have them *CoughBLMCough*). For this I have 2 suggestions either providing a way through tomestones/gemstones/hunt currency to purchase an item that would allow you to gain level through its use or giving us the ability to "tag" a specific job and give it a small amount of xp whenever we complete content on another job. This would allow us to do more content on our favorite jobs while still making progress on that thing you don't want to have to play to level.
I also think removing the restriction on abilities when we are level synced would help with the above as well as making it more fun to get out into the world to do content on your main even as you progress your alt jobs. As well as making it FAR less unenjoyable to level synch down. I can see where this would cause a lot of issues with balancing like in Sastasha with a warrior tank with all his lv 90 abilities for example. but i think this will be worth it not only is it more fun for the tank I think it would also be fun for sprouts to be able to see a Confiteor combo or a Comunio in their dungeon or because someone just wandered by and helped them out.
These are my humble suggestions. Not all are new, but I have been really disappointed with the leveling content/world content and felt I needed to make some constructive criticism.