In my case, I use several different types of machines: Personal Linux desktop, personal low end Linux laptop, remote servers where I have sudo, work Mac, shared remote work servers where I don’t have sudo. I want my setup to be basically the same everywhere so that my muscle memory works, but there are some things that also need to be a bit different for each. Hence, a dot files manager that lets me run one command to keep my environment consistent in all those different targets. I use chezmoi + git for it nowadays.