we need challenging, sustainable endgame maps

Hello.
I noticed that the game looses enjoyment for me, as soon as my character outscales the content difficulty. In other terms: I enjoy the campaign while leveling and also the solo self found end game progression up to reaching T15 maps. (that is only if not using overpowered meta builds like lightning spear + vault) As soon as my character gets a strength were I can speed farm a map, the game becomes boring and repetitive. Some builds that are formerly fun fall apart, because single skills deal high enough damage, so comboing them isn't really neccessary anymore. Other builds get near inifite sustain and can tank a few strong hits, so feel too safe.

There should be high end maps to do that retain the feeling of a constant challenge that I had when playing a weaker build during leveling / lower tier maps.

Difficulty in this game is rarely rewarded with better loot and very few players are going to be interested in playing difficult content while the XP penalty is there. Until they fix the reward systems there's not much point in making the game harder.