that doesn’t keep packages installed between distro reinstalls or swapping between entirely different distros. I’m talking about the actual packages and app data themselves that are contained in home.
It’s auto installed because everything is portable
Then you didn’t explain it very well. Your former comment clearly states that copying the files keeps the packages (so you don’t have to redownload?) and the data, but “doesn’t keep packages installed” (hinting that .desktop files don’t get found)