I never thought the ASCII graphics were a big problem in Dwarf Fortress; once you get used to it using a bunch of symbols as decoration, almost all the weird stuff ends up being things you placed yourself. On the other hand, the complete lack of UX consistency - whether a given submenu will use primary/secondary cursor keys, nested menus, or a pile of hotkeys - is a lot harder to deal with.
In addition to DF I also play Dungeon Crawl Stone Soup, a venerable (and actively developed!) roguelike with the classic ASCII look, and I'd like to present a counterpoint: once it became possible to play DCSS online using the graphical tiles interface rather than the ASCII look, new players overwhelmingly prefer the graphical. Stats that I have seen indicate >95% choose the graphical tiles. I myself still play both…
https://www.gridsagegames.com/cogmind/
It does, however, also have the fanciest abstract ASCII graphics I've ever seen.
(the other reason is that it's just a damn good game)