My last post on this topic, but it's becoming apparent you're missing the point and using your stats incorrectly.
To summarize what you said:
1) High pitches are easier to elevate - true, but this means nothing in isolation, easier to elevate does not suggest better results
2) High fastballs are easier to square up - false
Since you're a statistical person, I think you'd also see the fallacy of using the numbers you pointed to here: https://community.fangraphs.com/effect-of-pitch-selection-on-launch-angle-and-exit-velocity/
The up and in (good) pitches are one of the worst pitches for hitters to hit (as suggested by the EV you linked to). The up and away (mistake) pitches produced the best results (by measurement of EV and LA). But let's also consider that for those mistake pitches go a long way and has much higher exit velocity, henced average EV are skewed, but that doesn't mean they are happening more frequently (because the results are more favorable for the pitcher) compared to a low pitch. If you want to have a good leg to stand on, use batting average, wOBA, or xwOBA that weights each event the same. So to have a blanket statement that high fastballs are easier to hit (as Parkman and Dick Allen were debating you on had you read their posts carefully) or easier to square up, you're stats falls short of proving your point by a 90 degree launch angle.