I'm totally shocked by this thread. Weren't you the guy like not that long ago, JandK, who kept arguing that Larian is awesome for not having monsters with proper 5e stats and abilities? Now... you're saying Larian shouldn't have done such things?
I'm so confused.
Btw. I thought the idea about the goblin boss, and others like him, was that he had extra HP and stats because he was marked and blessed by the Absolute. If you notice, all goblins and monsters with the Mark are tougher than standard ones. Goblins who aren't marked have typical goblin stats. Well, at least the last time I checked anyway.