Forgive me for asking (I'm a casual, and I'm still fairly behind in content), but what is this "lower level" content you speak of? I've read your post a couple times and I don't really see mention of low level content... unless I have a different idea of "lower level content" from you (I'm thinking of like... lv90- content, like Dynamis, and CoP/AU/WoTG endgame things, and the first two Abyssea expansions). What are "the taurus and demon" you are mentioning, specifically?
My main reason for asking is that although I do have a tank job, at those levels I find trusts just fine to work as tanks, so keeping enmity doesn't really seem a concern to me. Even my friends of non-tank jobs can tank that tier of content without getting maimed. My friend who is a 99 THF tanks most of the things we've done in dynamis and assaults.
So, what content are you aiming for exactly that makes keeping enmity so essential?