That's exactly the situation I described in my long comment a second ago. It's also worth point out that it's not always as simple as reviewing/testing PRs and

That's exactly the situation I described in my long comment a second ago. It's also worth point out that it's not always as simple as reviewing/testing PRs and accepting them (which also takes time). Sometimes prioritizing a PR, especially if it is not something that was on the roadmap to be released just now, means having to write a bunch of new code and features to make it work.