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 can’t imagine a reverse camera being a better alternative to looking out the front windscreen - sure it being a bit further forward then your seating position and wide angle might give it a bit extra visibility around close objects, but it definitely does not offset the advantage of a natural ~200 degree field of view - and that is before you move your eyes or swivel your head. This is much much more valuable particularly for faster moving objects (which are a greater problems).
That said I may be biased because my current vehicle has rear front and side cameras so I get the best of both worlds!