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I love the pace of changes at GitHub after the "Dear GitHub" letter, it feels like they woke up from years-long hibernation.

Did they address anything in that letter?

Yep, all the three major issues have been mostly addressed: https://github.com/dear-github/dear-github

Have they addressed not being able to add custom text when someone goes to the new issue tab?

I wasn't. The third thing in the "Dear GitHub" letter was that people wanted to make the "Please check the CONTRIBUTING.md" customisable.