I probably worry about inconveniencing other people and being a jerk more than the average person, so that may contribute to my dislike of it.

Arguably one of the most important rules to live by, an extension of the Golden Rule.
Time is valuable, the most precious thing we have, and we all should be worried about wasting it. All those 10 second delays add up over a lifetime.
Guarantee I back in to a spot faster than you back out of one
Since you have to pass the spot to do so, impossible.
nope
So, you are able to pull an entire car length + width of space further than the forward parker, whip it into reverse, and still win the race?
What model McLaren do you drive?
Why are you pulling an entire car length forward? I think y'all are comparing the ideal situation and driver for a forward park to like the dumbest teenage girl backing in to a spot.
Where is your rear bumper when you start backing in, relative to the far edge of the desired parking space?
How does that compare to the front bumper of someone who pulls forward?
Also, I’d say forward parking is a single pass 95% of the time, while backing in is 50:50 for needing readjustment, at best.
I’m not talking about valets, or FBG parking gurus. Typical drivers.
ETA I see you estimated even fewer drivers (20%!) can pull in correctly the first time. That shockingly low, imo. What % do you think stick the landing backing in?
Let's take a step back here.
I think if you pause and re-read, you'll see that I exactly copy pasted the post I responded to about 1/5 for satirical purpose, to illustrate that poster's less-than-on-point remark's silliness.
If I pretend you're asking in good faith, a proper park whether forward or backward, involves swinging as far as you can to one side of the lot and getting the best possible angle into the spot. For a spot on the left hand side, that means:
Forward: go far right to give yourself the best shot at going directly in the middle of the spot on the left. Then angle yourself in.
Backward: go far left basically as if pulling into the spot on the right hand side opposite of your intended. Then angle yourself in.
If you assume the person knows how to drive, I'd give you the following estimates on time to park.
Narrow spot but no adjacent cars: equal time, maybe a half second longer for the back-in to change gears
Narrow spot, adjacent cars properly parked: one second edge to backing in
Narrow spot, adjacent cars improperly parked to make it tight: at least a ten second edge to the car backing in with cameras and mirrors. This is where driver skill really starts to matter though. I think I could be convinced that for anyone below average (i.e., if they had to retake their drivers ed exam RIGHT NOW they have a decent chance of failure) it is faster to pull in, although IMO also higher risk of damage to other people.
I was thinking through a wide spot...faster for all but I think the same pattern would follow regarding adjacent cars
Now where it gets tricky is when the lane itself between rows of spots is unusually narrow. Narrow enough that any car is gonna have to forward and backward a bit to get in, no matter which direction. I could be convinced that when lane space is an issue, there would be more rejiggering on the back in. So in a very narrow lane situation, I think the parking advantage goes to the forward parker somewhat soundly. if I think to the narrowest place I have to park regularly, it's probably one extra back and forth to get in forward facing, but like 3 to get in backward facing. Funnily enough, I believe that's because when forward facing, I can more confidently get ALL the way across the lane due to the advantage of the backup cam and proximity sensors, whereas I'm a little more cautious the other way around.
The super interesting part of the debate that's more or less being completely ignored by the dogmatic "MUST PARK FORWARD ALWAYS" crowd is the exit.
So, with the same genuine thought I put into a full answer to your question, I ask: How much difference in time do you think it takes to back out of a spot, especially in "a busy parking lot" which seems to be at issue, compared between the two methods? And how much total time in and out for like circumstances if you add the two up?
My hypothesis would be that even if the pull in was a bigger advantage than my afternoon test at CVS when I picked up my kid's eardrops and my subsequent thought experiment above indicates it actually is, the ability to leave the spot facing forward is at a bigger advantage on exit and the total time, for someone most concerned with being polite to others and trying to design the most efficient world possible, is such that you'd favor a back in for total consideration of others.
As of now, I certainly would. I think this discussion has made me put real thought into it and I'll now try to park in this manner:
1. Pull through (already my go to)
2. Back in (my current 2 is just go forward)
3. Go forward (save this for the narrow lanes described above so I get backup camera advantage as often as possible going in and out)