Because everything is a file in unix derivative land. That is a common accepted practice at least but optimizing for the common case here is the right thing to do. How often do people need to manage EFI things through the filesystem and how much of an inconvenience is it to have the initial mount be read-only? The answer is obvious to me because I know people run `rm -rf` often enough that having a safeguard in place is the right thing to do.