Divination does not allow you to put in much effort at all. There is practically no variation in training either. The entire Divination skill is about as significant as the Herblore Habitat, and that’s just one training method.
There needs to be a way you can train Divination at a difficulty and rate of activity equal to hunting jadinkos, with appropriate xp rewards. Designing a skill around AFK training is basically giving up on skilling as a legitimate ‘fun’ game.
Playing the game should be the basis of all design, not keeping it in the background while reading a book.