The intend behind NM modifiers seem to be to make the dungeons more diverse to do. Which is a very good goal to have.
Now, many of the affixes are extremely uninteresting, and it is too easy to just pick the ones you want, making the whole thing a bit pointless.
But the basic idea is good. Improve on it, rather than remove it.
Both by making better dungeon affixes, and by rewarding people for doing diverse dungeon affixes. Like, reward players for doing the different kinds of affixes.
One method could be the game tracking which NM affixes you have run in the last X dungeons, and if you run a dungeon with affixes you haven’t done in those last 10 dungeons, you get extra XP, items, glyph XP etc.
Another could be to have tracker of all NM modifiers, maybe at the tree of whispers, and when doing a dungeon, the modifiers from that dungeon gets “marked” as completed.
If you complete all the modifiers, you get big reward for it, and the whole tracking resets again.
All in all, rewarding players for doing different kinds of dungeons.
They could make a 1:1 copy of PoE maps without getting into trouble. Not that they should. PoE modifiers aren’t that interesting either.