I have had completionist characters but the Neverarine drives out all the foreign invaders from Vvardenfell, remember? It's part of the prophecy. But one of the nice things about the prophecy is that it's really what you make of it, for example shown in the final dialogue with Dagoth Ur you can claim to be Nerevar Reborn or just a hero making your own destiny etc. It's also shown throughout dialogues with wise women, Vivec, Caius Cosades and so on.
But my last two games I've actually modelled my characters on Nerevar, complete with the dark mohawk (the Indoril helmets are based on his face btw.) and primarily warrior and speech skills (some draining magics are reported from his battle with Dumac aswell), though of course you end maxing everything in this game.