Be happy he is even an end of expansion boss lmao. Yogg was a mid expansion patch boss, so was cthun, ysaarj wasnt even really shown besides his heart. People built up old gods themselves cause they think its a cool concept. We've already destroyed things much stronger why would you expect a whole expansion or something for Nzoth, seems like a silly assumption. Old gods in whole aren't even close as to the buildup Sargeras got, why would one measly old god(the weakest at that) get that type of spotlight. Their whole thing has always been corruption, he's got a raid packed with some corrupted heavy hitters so I think its pretty fitting. Anyone that thought nzoth would get a whole expansion is out of their mind.