So why is one of them native and the other hackable? Command line arguments were always marked as hackable weren't they?
Windowed and Borderless Windowed
That is the case, yes. The "Display Mode" dropdown in the image suggests that maybe it's possible to achieve this without the parameter? I wouldn't know as I don't have the game.
If the command line argument is indeed required, it should be marked as hackable.
Ah I understand. You mean the note is just alternative to the UI option. That'd make sense.