I think the design of the RFC process is such that a single person or a small group of people propose an rfc and decide what goes in it, so a wiki would not work great. When you do want to collaborate, you can always hand out push access to your fork.
The rfc process is centered around review and discussion, neither of which work well on a wiki.
Really, itâs totally fine to work on an RFC via the github UI, in which case itâs almost no different from a wiki in the first place; with the caveat that you have to make the initial fork and make it into a pull request, neither of which are too complicated. We could add better documentation for this workflow, perhaps.
Itâs unacceptable that you got yelled at in IRC for this. You donât even need to keep the history clean here, the rfcs get squashed and moved by the team before being merged.