X.509 absolutely lives on -- https://www.itu.int/rec/t-rec-x.509 last update was October 2024. However WebPKI uses PKIX which is fairly stubbornly stuck on RFC5280.
On the ITU side, they have made improvements including allowing a plain fully qualified domain name as the subject of a certificate, as an alternative to sequence of set of attributes.
On the ITU side, they have made improvements including allowing a plain fully qualified domain name as the subject of a certificate, as an alternative to sequence of set of attributes.