I can’t speak for any gatcha games, but the appeal of roguelikes for me is that I can pick up the game, play a run, experience something new, and then be done; very handy when you don’t know how long or how frequently you’re going to be able to play. In-game experience is replaced by getting better at the game as you understand how it works etc. It’s fine not to like that though, they’re definitely not for everyone.