I do NOT want fights to be nerfed. I just want mechanics to work reliably.

[Cyrus-Wallace]

Well to do it SOMETIMES yes, a lot of bosses do. But only roaming around attacking anything but the tank is weird.

This also happens with quite a few dungeon bosses, most notably the Golem in the Sunken Temple. If the aggro list still has the tank in the nr. 1 spot, you can assume it is a gameplay mechanic most of the time.

And sometimes is really dangerous. Like my previous example, I saw Bone Dragon turning back and AoE the whole alliance while I had the aggro of it. Or just running and not coming back after a while.