Nelfs were almost trashed during the First War, they got their asses handed to them by the Qiraji during the War of the Shifting Sands, exiled like half of their kind for their stupid anti-arcane bias, and went to live like literal hippies during 10k years in order to be better prepared for the next Legion invasion - and guess what, the Legion would have completely wiped the floor with them if it hadn't been for the fortunate (and most opportune) but unforeseen presence of Jaina's and Thrall's forces.
And nelfs were never sold as the ultimate Mary Tzu nation capable of defeating everyone by themselves. They look cool, and that's it, but don't pretend they should be something akin to the last boss of an arcade game.
What does this even mean...?
Look at all the Ally fans ITT wringing their hands and tearing their hair out at the mere thought of Turalyon being something more than Super Duper Good Boi #56327804