Just a few thoughts to move this conversation forward, and speaking as a
CSCWG interested party and not to advocate any position of Mozilla, I think
the answer depends on how strict or flexible the CABF wants to be as an
organization when it comes to interpreting the scope of a working group
A discussion on last week's CA/B call about code signing and time stamping
brought up a question as to whether the latter was in scope of the CSCWG
charter
(https://cabforum.org/2019/03/26/code-signing-certificate-wg-charter/).
Bruce said there was no CP OID for time stamping and that the
