Nixpkgs just does not have a review process that is on par with other distros.
We can agree on this. There is work to do.
Breakages on unstable are not uncommon.
I run unstable, and I have had this happen twice. Both times with Tmux (which is weird); but it was upstream issues. But fair enough. Maybe my systems aren’t exotic enough to experience the uncommon breakages.
Could nixpkgs do better? Yes. I mean, look at the backlog. You have to be active in the community to get your work merged in any decent timeframe. I think this is the most annoying part about the Nix ecosystem.
Think? We fucking know.