First rule of C package managers on Linux: "wrap distro package manager or GTFO". This doesn't seem to abide by that, at least from scrolling through the FAQ. I might've missed something though.
Coincidentally, distro packages are reproducible for good distros these days.
Coincidentally, distro packages are reproducible for good distros these days.
I don't think anyone follows your "rule" because it would be such a mess.