Agree, lack of any information is the worst. At this point it would be better if it just wasn’t possible to submit a PR since everyone has no idea if it makes sense to put any effort into research of Unreal codebase and making a PR since it probably will just get stuck and maybe even outdated at some point.
Couple related cases - How can I get my Unreal Engine pull request reviewed? - Programming & Scripting / C++ - Epic Developer Community Forums