Okay, so instead of letting the employee advance in their career, possibly earn more money because of increased responsibilities or skills, you want to pay them

Okay, so instead of letting the employee advance in their career, possibly earn more money because of increased responsibilities or skills, you want to pay them to sit idle? How does that help anyone? Anyway, isn't that just prohibiting a non compete without compensation for potentially lost income? I mean any law is arguably a prohibition from the right perspective.