Sorry but, 1 2 and 3 are options by your own logic. If 3 is an option, you are implying that hard jobs exist, so just play a hard job in simple content and optimize it. Healer is always going to be the easiest role in normal content for mmo. That's just the way it works. So if you want to be engaged in simple content, just dont play healer. Me personally, I find healer engaging enough in regular content because I actually play the game for fun and do what I want rather than doing strictly what is necessary. If somebody has an issue with me using my healing kit to the fullest, that's just weird. I find it fun and cozy for the group to feel extra safe with mitigation and healing. Like if I am healing a dungeon, there is absolutely no chance anyone will feel at risk. Maybe if you are healing and spamming one button aoe while only healing if necessary, the tank will be worrying whether they can survive wall to wall or not.