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.
I got in the habit of backing into parking spaces after I had a car that needed a jump start, but I had pulled in and no spaces next to me were available to pull the jumper car into. If you back in, in the rare chance you need a jump start, you will be able to drive the jumper car close to your battery