To provide a slightly differing perspective:

I seem to have been able to make to most of the Saturday-noon ones, but there consistently ended up being not a lot of people about, and I am far from confident enough to take an Active Position discussing stuff. (not senior enough, not familiar enough with the codebase beyond the small corners i've touched, possible impostor syndrome...)

Not sure i've seen an active chat except in the post facto logs, so...idunno. *flails indecisively*