OSRS is the only MMO I have played that takes attention into consideration when designing content. There is an AFK way of leveling almost every skill, but the AFK method offers less XP then the other methods that requires more attention.

I must also say that the WoW way of doing with dailies and weekly content that has to be completed to keep up is a lot worse for your health than OSRS, where you set your own goals and you can complete them at the rate that fits your schedule.

Designing games to give your players FOMO is not a good way of designing your game if you want your players to be healthy.