@film_girl Debian stable? Sure, next release when Trixie steps up. That's, what, a year to go still? And even then there's another year of support for oldstable. When I finally upgrade to Trixie (or the one after that), I will have to look out for the things that have changed.
If I used unstable or testing as a daily driver, I'd (have to) be careful with any updates. Because that is where these changes are introduced before they go into the next stable release.
No, maintainers shouldn't insult upstream devs or users. But users obviously shouldn't be filing bugs upstream in the first place for issues that are explained in their distribution's release notes.
And if Ubuntu and others quietly, or blindly, just copy everything from Debian testing, that is their own fault and I again don't see why you would blame the next stage upstream for Ubuntu's mistakes.