Earlier quoted context omitted.
> I find it odd that packaging for a specific distro is an upstream effort. I never understood why upstream source should include Debian/Fedora-specific files. This is generally frowned-upon in Debian too. Upstream's effort are nearly always wrong from the distribution's point of view, and extra busywork has to be done to get rid of upstream's attempt.
On the flip side, I definitely do appreciate when upstream includes a debian directory, as that means I can easily self-build my own package with the latest source, even if I'm on Debian stable or whatever and don't expect and update or backport.
Note also that making "a" .deb package is not the same as making an official Debian package that satisfies the Debian Policy and passes the automated linters (lintian, piuparts, autopkgtest, etc). The second will have the minimum quality that Debian expects.