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You have good points, but you'll have to realize that these little things just aren't worth the time and effort to fix. Most of these gripes you have with the game seems to be very minor QOL changes. You have to first take into account that this game is old. Being so, effort from the developers are not longer being put into small annoyances that most people are already acclimated to.
Instead, they're focusing on releasing new classes, content, and balance. These are what retains player base, and makes bank with Cheap Blade And Soul Gold. You don't ever hear people say, "damn, I love the balanced, faced paced combat style, but the inability to share quests kills this game for me. I'm out."
Let's face it, 95% of the player base is probably at endgame, where only Mushin tower, and arenas really matter. (Talking KR) Those guys aren't going to care much about the health bar disappearing, since they get to see a much larger health bar in those instances.
They're not going to care about sharing quests, because max level takes 2 days to reach, and everyone just does the same dailies on repeat afterwards.
I actually appreciate the little things that I get stuck on while sprinting. It reminds be that I have that Vault skill, and also tells me that develops purposes put collision coding and rendering to make that happen. So that might be a different take on the situation.
As for the horrible skill tips, I can only attribute that to sloppy translation, which can and should be fixed here in the west. Everything else, though seemingly simple, will at least take a 2 man programming team, a sizable amount of time to code and tear. That's a team that could be working on the new KFM/FM hybrid.