Sadly, the high school coaches frown upon this - perhaps because they don't see the value in weight and strength training?
There was a former MLBer posting here not too long ago that went against well-known beneficial philosophies also. When folks called him out on it, he said that his ideas worked for him so they'll work for everyone. Often times, those types of opinions aren't rooted in any research and are backed by anecdotal laziness. You're not alone.
For the record, and I think Cressey would echo this thought, it's not necessarily a "Cressey philosophy" as much as it is years of research that Cressey bases his training programs around. It's excellent training, but he didn't really "invent" anything.
Another for the record - if a high school baseball coach in 2014 doesn't see the value in weight and strength training, that person shouldn't be a high school baseball coach. Pretty simple.