2. The Valley of Eternal Blossoms checklist shows the Pandaren mounts, which are certainly still on the vendor, but as far as I'm aware you can't earn the currency to buy them any more? Should they not be classified as "unobtainable"? Or is there a way to earn the items still?

legacy but blizz say the back in a far far future; i think maybe mythic+ legacy in other xpac

Fixed in 3e73cde