The player should honor his high school team in the spring. I wouldn’t want a college coach to call the high school coach to be told my kid walked out on the team when travel started. I’ve never heard of a summer travel coach not respecting the spring post season isn’t over. Once a kid establishes he’s a college prospect then there’s room for discussion with the high school coach regarding summer and the fall.
I’m catching a whiff of something you need to be careful about. Don’t be a travel snob. If you want to be disliked at high school games talk a lot about your kid and travel ball.
When a kid has established himself and committed discuss the situation with the high school coach if there’s off season time conflicts. Most coaches want their players to succeed beyond playing for them.
My son played for a travel coach and took hitting instructions from a guy the high school coach detested and vice versa. It didn’t get in the way.