[RussianCow]

> If you use your GitHub profile as part of your personal brand / marketing then these things absolutely are relevant.

The problem is when others assume this on your behalf. I would take a lack of proper readme as a signal that the repo isn't intended for viewing and judgement by others, not as a signal that the candidate has poor communication skills. If the repo is for a library that the author has published and is marketing for production use, then sure, but I'd wager that does not represent the vast majority of repos on GitHub, and to assume otherwise is foolish in my opinion.