You can respond to issues by email. The formatting is already not consistent.
Re:GitHub CLI is now in beta
by dotancohen on Thursday February 13, 2020 @07:45AM
(#22317272)
> formatting ( markdown ) consistent.
This actually is not a good argument because Markdown is specifically designed to be readable as plain text.
The optimist would say limiting contributions to issues on web platform made the formatting ( markdown ) consistent. So that linking back to issues and commits was more standard, and therefore made Github Issues a nice tool to use over the competition at the time.