Re: choking up to make contact...
I'm not sure what comment you are referring to as rude, but I assure you that's not the intent.
As for the the way the MLB teams are "coached", it's already been said that watching big league players for cues on how things should be done at a fundamental level is largely a mistake. When they do things fundamentally sound, it's b/c they want to. Not b/c they fear what a coach may say or do to them.
I've spent enough time around very high level baseball coaches, where skills are still taught, to know that catching fly balls one handed is frowned upon. I don't think the examples of smaller gloves, past great hitters, and professional golfers need any more explaining. I guess I could throw in the example of scoring positions in lacrosse using shorter sticks than those of defensive positions.
Everything that can be counted does not necessarily count; everything that counts cannot necessarily be counted.
All the dishes rattle in the cupboards when the elephants arrive