

I agree that it’s a huge fuck up, my comment wasn’t in defence of the post office, just a related story :)
Whenever I have delivered code for a client it has always been in a way where the client has complete ownership of the code and can maintain it themselves later (or ask a different company that isn’t us to come do it) because that’s the only sustainable approach, and all companies should absolutely demand that all work done for them is done this way.
OP specifically said they don’t want to dual boot, and I honestly understand why they would say that.
When you dual boot you need to worry about what bootloader is in use and how it is set up. You might find yourself in a situation where you later decide to move fully to Linux and use the old Windows drive as storage but you can’t because if you wipe it then everything stops working.
Windows has even been known to destroy dual boot setups occasionally during Windows updates.
All very solveable if you have the right knowledge, but if you want to keep your life simple then swapping hardware has guaranteed safety (nothing can go wrong with the contents if a drive if it’s not plugged in, after all) and it’s very predictable and understandable.