I got what you were doing with it (suggesting it in a jokey way as if it wouldn't be fair to even bring it up), I was just using it as an opening to discuss alternative org-mode implementations. Emacs may have the canonical one, but it's not like it's impossible to implement elsewhere.
> "Regarding the REPL - what I mean is, run a snippet that executes in the context of the editor"
Is that not covered by the Code Runner extension I suggested earlier?
> "And as for Git, I don't really understand the suggestion."
Multiple Git repos, each one covering different system settings. In other words, if you work across two PCs, one Git repo for PC 1, another Git repo for PC 2. Alternatively, you could organise it in the same repo under different branches. If you know Git you'll know what I'm suggesting is trivially easy.