Missing gems mechanics from POE1 (leveling and corrupting)

I think the system of leveling gems and ability to vaal them with chance to enhance them is one part of POE1 that extends endgame significantly. Running less profitable maps if your build doesn't handle difficult content still feels like not waste of time (you have something to aim for, not to mention you can also turn them into profit)

I don't want that in poe 2.