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.
This is the technically correct answer. My good person, you have, very clearly, been thinking a lot about this! Well explained!!
Edit to add: reversing in gives you a much better angle than pulling in because it’s your front wheels which are doing all the steering work.