The reason is that I don't think it's a technical issue — in other words, it's the managers, not the engineers, who decide the priority here. Therefore, the right place to try to expedite this is somewhere more influential, like HN or Twitter, not GitHub.
I can anticipate that this won't be resolved for at least 3 months. Just be aware this issue has been around for over 2 years, and the last time someone promised to fix it was 6 months ago. Let's see.