The only instances of lerna being mentioned are people who use or work on rush mentioning differences between the two projects.
Assuming the lerna author is accurate, why just the angry blog post? If I had contacted MS and raised the issue via email, and nothing happened, I would have started raising issues on the project GitHub and making pull requests to rectify the situation. Not only could that actually work to resolve the issue, but the discussion would be public.
a pull request would be the same as an email or blog post at this point. it is just a way to communicate. why is a PR better then what they are doing now?