@wolf480pl
Partly historical, the #debian packaging workflow evolved from source tarball plus a .diff, the requirements for #gpl compliance suggested it was best to keep a copy of your sources to ensure you could provide them, and since then Debian as a community has developed a wide range of interesting ways to modernize packaging workflows, e.g. #VCS or #git driven (#dgit FTW!). What was your favorite VCS in the early 90s? If Debian were to start today, it would look very different.