Yeah, I agree with you on the first half. I don't think the second half is *automatic* because I see it too often NOT happen -- even with hitters who load/get to attack position correctly - that I wouldn't trust part 1 to properly create part 2.the entire postural thing is the error in the beginning of the sequence when the arms/hands get behind the body(no space) hence the postural changes thereafter. That’s how I see it.
I DO think 'part 2' can begin to emerge after MANY at-bats/swings when hitters work to optimize their results (both covering the zone and handling speed AND especially driving the ball hard). But it also can NOT happen, even as a player matures. And that player too often tops out below their max.
More than anything, I think a level of instructional focus on what I described in 'part 2' can ACCELERATE getting there, especially in young hitters but also in hitters that don't actively mimic their favorite MLBers, which boys often do and girls tend not to (though that is changing with great role models like Romero). IMO.