I'm used to those sorts of numbers for open issues without ongoing fixes - but the number of issues is actually only 5x the number of PRs.
That seems insanely productive for an open source effort.
But, how is having PRs open since 2019 a positive indication, and a productive one at that? Seems hugely unproductive to never close a PR unless the author do so (apparently? I don't know the dev process too closely).
Most be very hard to navigate so many PRs, and surely most of them must be unmergable after some months due to conflicts.
I have PR open since 2020 (small change for a bit of qol) still hasn't been merged and I believe that there will be major conflicts now.
Simply because I looked at some other tools recently and their PR backlog was simply a graveyard. A 3 year backlog seems really good to me in comparison.