jpoc:
I had a look on amazon today at a WD Blue 6TB drive.
Judging by the product description, I would be very worried.
The page headline was for a Blue drive but the product details were for a Red (SMR) drive.
What would you get if you ordered one from that page? Especially if the item was subject to amazon's co-mingling policy.
Obviously, as I am having trouble with my purchase from Amazon, I am not going to singing songs for them, but dozens of purchases from them (mother board, HDDs, Chromebook etc., as I used to get gift cards for them), I never have problem with wrong item been purchased or shipped, the parts number must be match in the end of the day, the description could be wrong as you found out, not big deal for me but the warranty might be an issue, but again if you are getting refurbished HDD's back as it is suggested here I don't think I've lost much by not having them.
PS: I've also found out you can actually connect Amazon about warranty issue, which I missed before: Amazon.com Help