A spectator is a young beholder. It is normal for some creatures to be stronger/more developed than their peers. He has got a trick or two from daddy/ mammy. And it does prepare you for when you meet a real beholder.
A spectator is not a young beholder, no more than a sparrow is a young eagle.
Personally, the most useless nerf they have put was to remove the resistances on the imps and the young hellboars. I think it is a great lesson on the tutorial to learn about the resistances of some creatures. But it is a minor thing, at least for me.
People wondering why they were doing so little damage to the imps was one of the top three most common bug reports/questions in the first months of EA.
I agree that the imps' resistance should be put back in, but with a dedicated pop-up tutorial: "You just dealt damage to a creature with
Resistance to that damage type, meaning it only takes half damage. Make sure to check the combat log or inspect creatures to view their weaknesses/strengths and change your attacks accordingly."