I have 3 "Genuine Fender Replacement" necks, the ones that came in a purple "Crown Royal" type sleeve. Built in early 2000s, two 57 P maple and one 62 J rosewood. They're all great necks with perfectly crowned frets and properly slotted nuts.
Those were very nice! IIRC they were all American Vintage necks and bodies, and they were discontinued (about 2004) supposedly because builders were assembling and selling them as if they came that way from the factory.
Times have changed, it's good to see that Fender is embracing the idea now. Maybe they will mark them so buyers will know they're getting a genuine Fender product but not one that came from the factory as a completed guitar or bass.
Also, it ought to put a dent in the business of the guys on eBay who part out new Fenders.