I would really love to see a "infinite" xp gather after max level.
So that you can, for example stack your experience up to a Limit of idk 500 Million / 1000 Million or whatever as a real MAX.
this should be in a new XP pool, so it wont affect the actual Level, once a new content release pops in with Level increases - so the pool just gets added after and no instant level up is possible after a lvl update
this would be amazing for leaderboards to see a total xp gained and would make people want to train train train and compare each other and go up the rankings in certain skills