I’m and end user
Yeah, we all are. What’s your point?
End users are also developers. All computer users are developers. You are developing.
user working for end users
By making a script that lets me get backdoors and shitty packages with ease? The linux package distribution system is a nightmare, Debian is the least bad approach. There is basically always a better option to using a .deb file. If you come across something that isn’t packaged, I recommend Flatpak, building from source (and installing unprivileged), or using the developers vendored tarball (installing unprivileged).
https://wiki.debian.org/SecureApt
By using local .debs you lose the benefit of:
Reproducible builds
GPG checksums
Stable release model
debian security team
Source code is like a recipe. Getting your food from the chef who made the recipe is fine, but getting it from another chef who… followed the same exact recipe is no different.
This is how the linux software distribution model works, distro maintainers are a CHECK on upstream.