There is some nuance to this. Adding comments to the stated goal "Everyone who interacts with Debian source code (1) should be able to do so (2) entirely in git:
(1) should be able does not imply must, people are free to continue to use whatever tools they see fit
(2) Most of Debian work is of course already git-based, via Salsa [1], Debian's self-hosted GitLab instance. This is more about what is stored in git, how it relates to a source package (= what .debs are built from). For example, currently most Debian git repositories base their work in "pristine-tar" branches built from upstream tarball releases, rather than using upstream branches directly.
What I've always found off-putting about the Debian packaging system is that the source lives with the packaging. I find that I prefer Ports-like systems where the packaging specifies where to fetch the source from. I find that when the source is included with the packaging, it feels more unwieldy. It also makes updating the package clumsier, because the packager has to replace the embedded source, rather than just changing which source tarball is fetched in the build recipe.
Oh, yes. This seems like nothing short of necessary for the long term viability of the project. I really hope this effort succeeds, thank you to everyone pushing this!
Lots. Because many upstream projects don't have their build system set up to work within a distribution (to get dependencies form the system and to install to standard places). All distros must patch things to get them to work.
A fair few I expect, amongst actively developed apps/utils/libs. Away from sid (unstable) Debian packages are often a bit behind upstream but still supported, so security fixes are often back-ported if the upstream project isn't also maintaining older releases that happen to match the version(s) in testing/stable/oldstable.
The longer answer is that a lot of people already use Git for Debian version control, and the article expands on how this will be better-integrated in the future. But what goes into the archive (for building) is fundamentally just a source package with a version number. There's a changelog, but you're free to lie in it if you so wish.
Now if a consequence of that could be that one (as an author of a piece of not-yet-debianized software) can have the possibility to decently build Debian packages out of their own repository and, once the package is qualified to be included in Debian, trivially get the publish process working, that would be a godsend.
At the moment, it is nothing but pain if one is not already accustomed and used to building Debian packages to even get a local build of a package working.
The problem is that "once the package is qualified to be included in Debian" is _mostly_ about "has the package metadata been filled in correctly" and the fact that all your build dependencies also need to be in Debian already.
If you want a "simple custom repository" you likely want to go in a different direction and explicitly do things that wouldn't be allowed in the official Debian repositories.
For example, dynamic linking is easy when you only support a single Debian release, or when the Debian build/pkg infrastructure handles this for you, but if you run a custom repository you either need a package for each Debian release you care about and have an understanding of things like `~deb13u1` to make sure your upgrade paths work correctly, or use static binaries (which is what I do for my custom repository).
(1) should be able does not imply must, people are free to continue to use whatever tools they see fit
(2) Most of Debian work is of course already git-based, via Salsa [1], Debian's self-hosted GitLab instance. This is more about what is stored in git, how it relates to a source package (= what .debs are built from). For example, currently most Debian git repositories base their work in "pristine-tar" branches built from upstream tarball releases, rather than using upstream branches directly.
[1]: https://salsa.debian.org
I don’t think it’s a bad move, but it also seems like they were getting by with patches and tarballs.
How many Debian packages have patches applied to upstream?
The longer answer is that a lot of people already use Git for Debian version control, and the article expands on how this will be better-integrated in the future. But what goes into the archive (for building) is fundamentally just a source package with a version number. There's a changelog, but you're free to lie in it if you so wish.
At the moment, it is nothing but pain if one is not already accustomed and used to building Debian packages to even get a local build of a package working.
If you want a "simple custom repository" you likely want to go in a different direction and explicitly do things that wouldn't be allowed in the official Debian repositories.
For example, dynamic linking is easy when you only support a single Debian release, or when the Debian build/pkg infrastructure handles this for you, but if you run a custom repository you either need a package for each Debian release you care about and have an understanding of things like `~deb13u1` to make sure your upgrade paths work correctly, or use static binaries (which is what I do for my custom repository).
[1] https://www.pkgsrc.org/
Sincere question. I haven't interacted with it much in ages.
so kudos to its authors