We already have a concept known as a cure-bot. And even if some people notice, as long as the tank and the rest of the group are alive, you're unlikely to be kicked out of the group for it, at least in casual content. In fact, nothing prevents a tank or damage dealer from pressing only one button. Some people just don't want to fight. They want to socialise, make pretty pictures, collect relics. And no matter how much you simplify the combat in the game or the combat classes, they won't want to fight. Those who wish to press only one button can do so now. And I don't think anything good will come of an officially created rotation with a single button. I have no doubt that people will use it. I just don't think they should have that option in principle, at least not officially. Those who really need it are already capable of making the game play for them (on PC, of course ./wink). And "play" at the level of a good player.