Why don't hitters start in their launch position and swing from there?
Yes launch is the instant before the beginning of the back half (foot, leg and hips) as it initiates the swing. Lauren below basically just uses a heel drop; Josh uses a monster leg kick but at launch they look very similar, the third frame is what I consider launch position, from Laurens sequence look at frame two and three her front foot doesn't move she just lifts her heel and drops it but the positions are much different you can tell in frame to she kinda looks ready but you can just see the difference in the torque and load in frame three versus frame two.Do you consider launch position as something different than what a no-stride hitter would use?
There's very few if any things we do athletically from a static position.
That said, the challenge is two: 1) if no-striding, to not be TRULY static but to have under-the-hood athletic actions (ie, Pujols), a huge challenge for a young hitter and why I don't advocate no-striding, it's harder that it looks to really do it right, or 2) if striding, not using that movement and momentum as your engine but creating stretch and resistance BENEATH the movement that is the true driver of your launch and source of your power.