So supposingly if you slot more skills from the same skill tree into your hotbar, that skilltree will gain xp faster. right? well nope, it's still bugged.
I tested it today with vampire skill line, at vr 14 on craglorn overworld mobs, each giving 144xp. Here are the results.
With 1 skill slotted (drain, mist or ult, i tried alternating the 3). you kill a mob for 144, the skill line gain 144. Working as intended.
With 2 skill slotted (any mixture of the 3), you kill a mob for 144, the skill line also only gain 144. Its suppose to gain more xp now that you have 2 skills slotted.
With all 3 skill slotted, a 144xp kill will net the skill line only 144 as well.
This is the same for quest turn in and is NOT working as intended and its NOT a UI bug. I logged in and out after each kill to confirm.
The skill itself gain xp as intended though.
There was a discussion on bugged skill line prgression about 5months ago but it was first claimed to be a UI error, even tho it was 15+ pages long with everyone confirming it is not a simple UI error. Then it was claimed to be fixed, i didn't test it since then, but tested it today and it is still broken (or broke again). I mean its bad that its bugged but worst that they say its fixed but its not.
For reference: Not sure if important, but i was vr14 killing craglorn mobs.