One-wiki

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One wiki is the preference to use one W3C wiki rather than lots of individually siloed wikis per WG/IG/CG.

Advantages

Collaboration
- Anyone from any WG/IG/CG can help
Allows for more serendipitous positive interactions
Being W3C-wide means anyone can fix typos
Lowers the barrier to people slowly helping with a WG/IG/CG
More people can indicate some level of interest without committing to joining / mailing list noise, etc.
Such incidental participation helps onramp people to greater participation
The more such "weak ties" we can encourage at W3C, across groups, the better the chance of harmony across W3C, at least socially / politically, which tends to be a good start towards technical harmony.

Silo (per WG/IG/CG) wikis have several disadvantages:

Requires separate login approval barrier (which is sufficient for many incidental contributors to not bother with).
Discourages cross-W3C collaboration - e.g. cross-wiki links require absolute URLs rather than simple [[single-phrase-term]] wikilinks
Encourages tribalism

Make the automatically generated home page for a (community) group link to a w3c-wiki page instead of a private wiki, as the default.
- Only allow the option of a group-specific wiki by warning about the downsides and make the chair explicitly [x] ok to accept limitations etc.