So Demon Hunters being able to use Metamorphosis, Mages being able to summon Water elementals, and Warlocks summoning demons aren't part of lore?
Yeah, Arthas.
I'm talking about Blizzard's general design, which more recently has favored playable Necromancers to be melee based.
Just like Paladins are all warriors.
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https://heroesofthestorm.fandom.com/wiki/Xul
Except those NPCs with HotS abilities have a logical class where those abilities can be transferred to. See Sylvanas' HotS abilities now going to the Hunter class. See Thrall's Crash Lightning and Sundering going to the Shaman class. See Illidan's The Hunt going to the Demon Hunter class. Where can Gazlowe's HotS abilities go? They're not going to engineering.
Further, Tinker and Alchemist remain the only WC3 heroes whose abilities have never appeared in a WoW class.
The difference being that Paladins, Vindicators, Sunwalkers, etc. all have the same abilities. Engineering doesn't contain any abilities from the Tinker hero.