And Ed25519 is not supported by major CAs.

> And Ed25519 is not supported by major CAs.

Perhaps because until February 2023 (when FIPS 186-5 was published) it wasn't approved for US government use:

* https://en.wikipedia.org/wiki/EdDSA#Standardization_and_impl...

So there would have been complications for a sizeable base of potential customers (US, contractors, allies).

Oh, major CAs. GP spoke of Ed25519 not being useable on "the big tech internet", but didn't mention certificates or certificate authorities.