To me, it seems objectively easier to pull into a parking space forward and then back out of the space when you are ready to leave. You don’t have to line up with the lines while driving backwards, and it’s easier to keep from hitting other cars as well. So why back in? To me, the only advantage I can think of is that you can get out quicker, technically.
Edit: I do not need driving instruction, just wondered why. The reasoning.
If you look at the state driver’s manuals from the dmv it actually says exactly that. It’s already considered a privilege. Otherwise you wouldn’t have to test into it and pay annually to keep your car on the road.