Looks like Dear GitHub[1] is having a rather quick impact on the product; first templates[2], now this:
[1] https://github.com/dear-github/dear-github
[2] https://github.com/blog/2111-issue-and-pull-request-template...
[1] https://github.com/dear-github/dear-github
[2] https://github.com/blog/2111-issue-and-pull-request-template...
So there is a quick reaction, but work on the idea may have been hidden from the public for a long time.