check out opmsg how it achieves compatibility with gnupg and imagine a tool that actually looks like gpg but figures out which crypto backend to call.
Interesting project, but I'd personally want to see a lot more involvement and vetting from the crypto community at large. Especially when it creates new protocols like DH key exchange over email.
Using PGP/GnuPG isn't always easy, but it works for so many things. Signing code, encrypting files, emails, signing messages - replacing it is a fairly high bar.
I'd love to see encryption easy and used everywhere, but a few popular apps don't add up to replacing this old work horse.