I think a hitter needs to start 'loading' when a pitcher starts their movement/moving. A hitter needs to time the ball in air. Possibly if a hitter guesses or waits to long to start their 'load' I feel they may shorting up the loading process and need to rush. This may/ will effect them properly 'loading'. Either way it's 'timing' of the ball in the air.
I think we are in agreement on the need to avoid rushing the load and swing. A late load will definitely cause all sorts of problems. I always tell my students that the load and stride should feel like Sunday morning (non-tournament weekend). Slow and easy. Once the heel drops, it's Monday morning on a school day.
Just a difference of how to get there. If you know you're ahead, I'd rather see the hitter start later and maintain her normal rhythm than start too early and get "stuck" in the swing waiting for the ball to get be in the air. Or having to slow her swing down because she couldn't wait back long enough. This is on a pitcher who is consistently throwing slower than the hitter is used to, not a changeup which is a whole different animal.
Of course, if the swing is out of sequence (hands ahead of hips) that's a whole other can of worms.