Because unless you use just one system daily or even weekly, customizations are nothing an annoyance since it’s unlikely you can clone every customization across every system you use daily.
But you can, even for physically distinct machines: just package-up your emacs/environment/shell/etc profile into a bash-bunny USB stick, such that the bunny uses its keyboard emulation to type-out and run the commands that load your profile into your current machine.
I would recommend a Raspberry Pico as a fake keyboard, it has 2MB of storage. But that all falls apart when you are not allowed your own USB devices...