So you want a HS coach to develop a player in a 2 month HS season?
They better coaches do and will help with development.
HS is not typical 2 months, this year everything is shorten but in a regular season can be a summer program, fall , and finally winter play until March+ depending on the post season. That's like 6 months worth of practices, scrimmages, tournaments, league playing, post season, and team bonding. If players can't develop during that durations well yeah might be time to look at something else.