You gotta look at it like this though. Last night's TakeOver featured precisely one homemade talent in Baron Corbin, two if you include Bayley. Every other competitor on the card came to the WWE from another promotion. So as far as a developmental area goes, NXT is still pretty much basura. As a wrestling show it is probably better than Raw/Smackdown, if only because Vince isn't booking NXT.
The revival and American Alpha as well.
But I have to disagree with you totally about NXT.
NXT is developmental, not just a wresting school.
They're not just teaching these guys to do scoop slams and cross body's.
These dudes are figuring out their wardrobe, brand, entrances, persona, promo's, how to play to the hard camera, facial expressions etc.
So while Sami Zayn was El Generico for years. This is a whole other ball park as far as his career and training goes. So in that respect he's a total NXT product.
Same with Finn, obviously these guys are all playing to there pre NXT strengths. But the packaging and final shining of the product is on the E.