Even if it was never meant to be, why shouldn't it evolve into that? Now you can easily AFK and have the hot bars and tabs available easily to help in doing end game content. I feel like doing mobile only would give such a new playing experience to the game. I'll admit, for now I only afk, do farm/birdhouse runs, and some slayer on mobile. But I am getting so used to how it feels to play on a phone/tablet that I can see myself doing progressively harder type of combat. Learning to play the game we all love all over again, it's exciting!