I learned about chess960 the other day. It's a variant Bobby Fisher invented because he was bored with "theory" (ie wrote memorization of openings and positions) and wanted a fresh experience. Its basically just chess but you put the back rank (non-pawns) in random positions. As a result you have to (or get to) reason through things from first principles each game.
I guess this is just the random aspect of a rogue-like, but it struck me as very similar to roguelikes. The fact that the experience is different everytime makes things more playable and sparks a certain sort of joy when the randomness variables compliment eachother in effective ways which you can design a game plan around.
> I think any "well known"/traditional game combined with rougelite elements can be a huge success nowadays
This is basically the entire thesis of slay the spire and why its massively succesful.