that workflow seems fine if it works for you. seems overkill for debian but if it works i don’t see anything wrong with it.
one way I do it is dpkg - l > package.txt to get a list of all install packages to feed into apt on the new machine then to setup two stow directories one for global configs. when a change is made and one for dot files in my home directory then commit and push to a personal git server.
Then when you want to setup a new system it’s install minimal install then run apt install git stow
then clone your repos grab the package.txt run apt install < package.txt then run stow on each stow directory and you are back up and running after a reboot.