This is good feedback, thanks! It does sound like there's a couple of bugs in there: the high-level pocket gear should have a default Endurance prereq so that literally-brand-new players can't wear them. (That's a long-standing bug that I didn't address for a long time because we didn't have "default-prereq" tech, and I didn't want all crafted cloth gear to be saddled with Endurance reqs... but it's a bug I can and will fix now.)
And healing is supposed to generate a fair amount of aggro... so it's probably broken for Priest in some way that I'll have to investigate. Or it could have gotten entirely broken again. Aggro is one of the hardest systems to balance and maintain, in large part because it requires a group, which is hard to emulate during development! But we'll get it right eventually.
But anyway, thanks for the insights!