Yes the "learn to adjust" mantra is fine for amateur softball players but it's not a good idea for MLB players to follow. It's apples to oranges.Nick Swisher made a career out of "knowing the strike zone and not expanding it". He had a 12 year career where he was 13% better than the average MLB hitter based on OPS+. He said he'd even take pitches he knew were bordeline strikes becasue he knew he couldn't do anything with them and would rather take a chance that they'd be called a ball. Changing his approach to "adjust" to the strike zone of the umpire on that particular day would have required a complete change in hitting philosophy of someone who had a pretty successful MLB career.