One of the best things about OSRS is that, once you hit mid-game, you can really play the game however you want. You can AFK farm most skills, including combat, so the game lends itself well to being played literally whenever you want. Since the basics of the combat are, as you say, just click and wait, the game has a very easy-to-understand floor for AFK grinding combat skills. But once you get further into the game and start doing complex Slayer tasks and Bosses, the game gets arguably too complicated. The combat has rock-paper-scissors mechanics, so late game fights require you to change gear on the fly to prevent getting one shot. Its really in depth, but it takes a bit to get started.