The main benefit of the full squat is the ability to produce maximum force through floor,and engaging the maximum amount of muscle through its full range of motion. Plus i think that when it comes to sprint acceleration the movement angles are more specific to the full squat. Also Some serious core activation at the bottom of the squat helping your force transfer.
like other people have said sometimes specificity can over complicate things. Most of the time i boil things down to putting force through the floor.
But i do like your point, you need to fill those gaps on the force velocity curve.