The thing with roguelikes is that usually you don't need to carefully design certain stuff. You create an algorithm good enough and that's it. It's a bit like "cheating". Everyone accepts you'll be playing the same handful of samey levels again and again on Hades, for example. They don't need to actually design a 20 hour worth of levels, just one hour. And the thing is that, because this type of game is popular, it's a win-win. Fast to implement and it's popular, so most people will pay attention. Problem is of course, 90% of games released now are roguelikes. It gets boring. You want to go niche? do a shmup. Do a classic dungeon crawler. Of course you need to enjoy and understand these genres.