[davexunit]

> If I can't rely on _specific versions_, I have gained nothing at all vs. using .deb.

You can rely on specific versions of software build with specific dependencies, each using specific configure flags, a specific build system, etc. This is one of the major improvements over traditional system package managers that Guix and Nix offer. Both package managers, like Flatpak, can be used on top of any existing GNU/Linux distrubution, BTW, so you don't have to use a distro that so greatly offends like you like the one I help develop. You've drawn a whole lot of conclusions without knowing the facts and have been pretty rude in the process.