Nala is a great apt frontend. It supports parallel downloads of packages and speeds up the whole process up a lot.

Not sure which commands irk you as too long. Nala makes a good overview of changes like which package is bumped to what version and where it stands now. So I basically only use

nala upgrade

and take it from there. Updates the sources, lists the diff for upgradable packages and ask me to go forward or abort.

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No, should work for every game with save files. I think you mean something like the account system in Destiny with internal login. That is definitely not necessary.

My last example was TMNT: Shredders Revenge. Played it on GamePass, bought it later and have all my save files. Other example: Nier: Automata, same thing. That one is no longer on Gamepass and I still have all my save files I started while playing on Gamepass

Should you buy it later the save file from the GamePass version carries over. Speaking from experience.

It’s not a different version, just a different license for the game so to speak