AAAA pitchers are the ones who lack "minimum velocity," in that case they have to be the unicorn with both exceptional secondary stuff and command. It's been done, but it's rare.
But once a pitcher averages 92 MPH or so, additional velocity (until you get to the upper 90s) has little marginal value compared to movement, secondary pitches and command - ML hitters can crush 94-97 FBs without good movement in the sweet zone.
Conversely in hitters, a key skill is being able to pick up the spin on the ball, recognize and avoid chasing low sliders and curves. Because few minor league pitchers can throw consistent off speed stuff, a lot of hitters can work their way up the ladder feasting on FBs.