It's good that you're able to get laid at 5'7". I would expect a 5'7" man to be able to have sex with women 5'3" and under. The fact that you got multiple women taller than 5'7" is good. What was it like for you to have sex with a taller woman?
One of my neighbors is a funny-looking guy, he's overweight and is probably 5'5'' or below. His wife is tall and model-looking, as is his two daughters. Though to be fair, I can't guarantee that the daughters are 100% his, but this at least shows that in an LTR the height barely matter. Though it's a bigger variable for casual sex, the game tramples it completely. I don't think that having sex with a taller woman is anything special, the women I find the hottest are shortstacks with big boobs and athletic body.
The only thing to note about sex, is that I didn't encounter a single woman my height or taller that would have a problem with the size of my ****, while for most women below 5'4'' my 7 inches are too big to fully fit it without causing discomfort, so I need to hold back with the pounding, which makes sex less fun to me. With taller women, I usually can go all out. As far as I know, it's not because of the size of the p*ssy (most women have a similar sized one), but of the position of the uterus relative to the stomach.
I agree with you that height is a bigger issue when trying to arrange dates via an app than when trying to arrange dates through real life methods.
In real life, average height + is good enough. On swipe apps, the threshold is 6'0"+, which is around the 85th percentile for men in the United States on height.
There's no threshold, only relative ease. The word "threshold" implies that if you aren't meeting it, you're doomed, which is simply not true. In the first place, it's hard to perceive height on a photo. A taller man with ****ty photos will have zero success, while a shorter than average man with amazing photos can slay it on Tinder. It's just that he won't have as much success as a tall, handsome guy who also has crazy good photos.
You're correct that the bottom 5% of men on height are not desired. It's far more than that. It's the bottom 35-40% at a minimum.
It's simply not true because the vast majority of men already had the least one gf before 20. Looks in general are a big variable for the top 10% and for the bottom 10%, for the rest of us other qualities play the defining role.