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.
Where I live, people give zero fucks about which direction the spaces are aligned. Even with giant arrows painted on the lanes, they will drive down the wrong way every damn time. I will stop my car and wait for their dumb asses to back up the way they came before I move. I could honestly care less which way you go into a parking spot, but driving the wrong way on one way lanes drives me insane.