This is going to seem either beyond idiotic (which it may be) or a troll (which it is not) but: is this game actually fun? Like, if you have zero nostalgia or anything, and your evaluation of it is based solely on what it is, is it something a person in their 20s would want to play? Is it fun in a different way than, say, Dwarf Fortress is fun? (Haven't played DF but I think I understand why people do.) Would really…
There are people who absolutely thrive doing the things NetHack rewards you for in the long term: perseverance, patience, planning, resourcefulness, risk management, strategizing, analyzing and learning systems... I feel like it has a timeless and ageless appeal to a particular kind of player and has never been quite palatable to mainstream audiences. If you like NetHack today you probably do it for the same reasons you would 30 years ago.