Please don't.
The old models had some glaring issues that we had to hide by either overlighting or not letting any lights touch our faces at all. The old geometry constantly threw any sort of lighting completely out of whack, and the "sharpened" features were mainly just our low poly models making us look like Gothic 2 characters instead of anything fitting into this game at the current moment.
Other than that ye, more options would be nice. In my honest opinion the new ear clasps are a vast improvement, but a matte option would of course be nice and appreciated. The darker options for Wildwood Elezen are already pretty matte, but the more choices the better, especially for duskies who kinda got shafted in terms of customization concerning the clasps.
Some change should be embraced, yes we have seen our characters for thousands of hours, but that doesnt make imperfections which existed because of technical limitations features that should be celebrated. For years Elezen were called the most (unintentionally) lifeless race. Nice for screenshots under curated light and for cutscenes that just so happen to have every zoomed in character's face completely in shadow most of the time to hide the low poly misery (especially endwalker tried to hide a lot of uglyness with clever lighting).
Frankly, old Elezen models were bad, and no textures in this world could have fixed them. I liked them, but the new ones are an improvement in every way.
The moment we would revert to the old models, we would have us walking around like an army of Brandihilds.
Returning to a time where we had to avoid every single light source in this game to make our eyes not look like dead wooden objects, our faces like a bad clay mask, sounds just like a completely wrong step to take.
