It just wouldn't make much sense to cram a bunch of bells and whistles into a rock solid blockchain that mainly does only one thing, but does this thing perfectly.
That would be very bad programming as well and that's also my main concern on blockchains like Vitalik's. They cram so much functionality into it, there is a good chance to integrate some vulnerability or even break the whole thing in some way.
Yes, the Liquid BTC sidechain supports NFTs.
https://bitcoinmagazine.com/business/raretoshi-nfts-on-liquid-bitcoin-sidechain