We implement it, but I don't think the way it was done is that good. Web clients cannot decrypt it because the NIP-07 extension and NIP-46 signers don't offer custom methods for it. Right now only Amethyst and Damus support it. And if somebody creates a version that can get more clients to use, I would be happy to support on Amethyst as well.
This is why I never spec’d it, so i didn’t have people complaining how bad it is because they can’t do it in the browser. Noone had suggested something better yet.
Yep, let's hope somebody comes up with something better. 🙏