An inside changeup?

This pitch seems as dangerous as a pitch could be. Yet, some very successful pitchers employed this pitch with much success.

What is the concept and can it be effective at the high school level?

The reason the pitch is considered dangerous in nature is because when offspeed pitches are away a hitters bat path will have already cleared the zone when swinging resulting in a miss. However, when that same pitch is on the inside corner, the bat path has a chance of catching the ball on the upswing. Potentially, this could cause a long fly ball. It is essentially the concept behind the hanging breaking ball.

Yet, the inside changeup was thrown with a modicum of some success at the big league level.

Here's why.

Elite level hitters recognize pitches quickly on past experiences. When they see the ball on the inside part of the plate they think fastball because no one would dare throw on the inside part of the plate- it contradicts convention. That's why it was so successful.

Now, at the high school level I think it's a terrible idea. High school hitters haven't had enough experience to quickly recognize pitches. High school hitters see and react rather than anticipate and look for visual cues. There is a monumental difference.