Aside from any major QoL suggestions that may never happen or is a huge undertaking; here are some "minor" QoL much needed changes.
1. Remove loading portals within dungeons. We already loaded the dungeon, and now we have to load other parts of it? The work around - is to walk backwards into the portal to avoid load screens.
2. Remove loading screens upon pressing 4 to revive. For example, if someone is dead in Mushin's Tower and they press 4. They are forced to load the zone again for some unnecessary reason.
3. Received Items - multiple items from system rewards need to be received all at once. For example, retrieving 30+ HM xp charms from the 6 hour login reward makes them receive 1 at a time, spamming 30+ lines of text in my chat and actions are locked until complete.
4. Increase the amount of mailing item slots from 3 to at least 6.
5. Reward boxes in quantities of 2 or more cannot be opened while moving. Try it yourself. When opening a single stack chest reward while moving, it's fine. But once you try opening 2 or more while moving it says "unable to socket"? Not sure how opening multiple boxes = attempt at socketing, and why the system prevents us from opening multiple boxes when one is fine (during movement, non-combat).
6. Option to open multiple boxes all at once instead of one at a time. I know BnS Buddy has this feature.
7. A history tab added to Guild functions. Permanent historical information such as: X joined, X left, X donated, X crafted, X got guild item, etc allows transparency and makes it easier for leaders to manage their guilds.
8. Death in 6v6s + DC'ing cancels the prompt to rejoin the match (provided you didn't take too long to get back into the game and the match is still active). Sure, someone could ress you, but this shouldn't be required to circumvent the issue.
9. When you DC and attempt to log back in it says "account already logged in" even though your friends can confirm you are offline and your character is gone. The message makes the game close, forcing users to relaunch the game, again.
What are some other QoL you would like to see?