Top tip, if tired, replace the rm -f part of the command with something innocuous for a first run.
Actually, is better to do this mistake once so that the two important lessons are learned...
Backup (obviously, in your case it was backups, but the point still stands) and double check your command if it has potential for destruction 👍
You can have both python 2 and 3 on the system. It just depends upon which is the default as to how much you break it 👍
The symlink to /usr/bin/python is the important bit for most software. For deb-based at least, update-alternative is your friend.
I had an advantage pro, original, but the rubber fn keys eventually gave up the ghost. Also needed something more portable for work, so have migrated to ergodox now.
Still miss that keywell though
This is the answer! Next question is why doesn't the flatpack install do this for you?