Greenmonsters
Wannabe Duck Boat Owner
The problem is that the catcher cannot see something like a hitter dropping their hands during the load or other things which are exploitable weaknesses.
To your question I place more emphasis on knowing the weakness of the hitter especially at the upper levels. We throw balls to strengths and strikes to weaknesses. My pitchers have some exceptional pitches, but thrown to the wrong location to the wrong hitter it can leave the park.
I rely on myself and my coaches to assess the strengths and weaknesses of the hitter, and my catcher to make the pitch that is called as effective as possible by tweaking the location or at times substituting a pitch. Once we get through the order and know what works and what does not, it is not uncommon for me to turn it over to them and let them run with it.
IMO there is no right or wrong answer to who should call pitches. Like anything else you should take full advantage of the strengths of the players and the coaches. I have found the most successful approach is a hybrid. A collaborative effort between the coaches and the battery with appropriate latitude afforded to the catcher.
A well-reasoned and sound approach no question. Personally, I place a slightly greater emphasis on working off the pitcher's strengths.