Seems a strange requirement indeed. What happens if you didn't want to save the changes? Rather what is good to have is saving the state so can be recovered but

Seems a strange requirement indeed. What happens if you didn't want to save the changes? Rather what is good to have is saving the state so can be recovered but not committing changes to file. Protection against losing progress isn't only related to the software itself but also the environment. E.g. window manager crashing, operating system crashing, power outage, etc. All the times I had to recover file changes wasn't because the editor crashed but due to something else.