Completely agree with Old School about the wide spectrum on what you see in HS baseball and coaching. Even within our league of six teams in a baseball hotbed like SoCal, you see the huge differences in coaches and programs, opportunities for players to play in college, and so on.
One thing I believe most long-time posters will agree on with this subject is that no parent should ever rely on their HS baseball program or HS coach to get them to the next level of college baseball. Some of the elite HS programs and coaches still have reputations and connections to significantly help a kid get recruited to play college baseball. But the vast majority of them do not, and too many kids miss a chance to play college baseball waiting around expecting to be noticed by college coaches through their HS games and HS coach.
There are numerous threads on this forum about the importance of travel ball, getting private coaching, pursuing workouts at baseball specialty facilities, going to Perfect Game events and other showcases like Headfirst, Stanford, Showball etc. and so on. Except for those rare top HS talented players, you and your son need to take charge of his future if he wants to play college baseball. Stay within the parameters of what the HS coach wants him to do in season, but then set your own path for the rest of the year. Find a balance where the HS coach would be a positive reference if a college coach called (which seems to happen less and less now) but seek other options like travel ball coaches or private instructors who can be references with scouts and recruiters. There are numerous instances of kids who were able to land roster spots on college teams despite being on poor HS programs with bad coaches because they took the initiative to get seen by college coaches who recognized their talent. Sadly, there are likely just as many talented kids who are not playing college baseball because they relied entirely on the HS coach and program to get them exposure to colleges.