Slot can tempts people to return and playing the games. Many slot games available on each casino and casino always release more and more casino. That is why people still curious playing slot game because they gets something different from one slot to another slot.
I guess the simplicity of the game and chance to gain big is the one makes people get attracted on slot games.
Casino games are not my thing but over the years I have tried many different types. Lately when I have played in crypto casinos, what I play are slots. Probably because of the simplicity as you say, the great variety, and that you don't have to think. You just keep spinning. However, one must also be aware that slots are the most profitable games for the casino.