The "client cert" requirements were specifically not a CABF rule because that would rule it out for everyone complying with those rules, which is much broader than just the CAs included in Chrome.
Some CAs will continue to run PKIs which support client certs, for use outside of Chrome.
In general, the "baseline requirements" are intended to be just that: A shared baseline that is met by everyone. All the major root programs today have requirements which are unique to their program.
Some CAs will continue to run PKIs which support client certs, for use outside of Chrome.
In general, the "baseline requirements" are intended to be just that: A shared baseline that is met by everyone. All the major root programs today have requirements which are unique to their program.