The problem with Fire Attunement - in my understanding - is that heroes see it as an
offensive rather than
defensive enchantment. As soon as you zone, they'll put up Aura of Restoration - which I figure is because they're programmed to recognize it as a defensive spell that needs to be recast ASAP. They'll recast the Attunement too, but only when engaged in combat - which is why I'd call it an
offensive buff.
Either way, I've abandoned Elemental Attunement on my heroes because I'd have to effectively precast it for them
and for myself before every fight, not to mention cover it properly with Fire Attunement and Aura of Restoration. When I'm not settled into a pretty stable Searing Flames build with Fire Attunement, GoLE and Glowing Gaze, I find myself putting Mind Blast on them more and more frequently. Even if they can't handling the build right, things are dying around me all the same