Earlier quoted context omitted.
Contracts like that are frequently unenforceable in the US. A no-hire provision is not a provision you agreed to, and yet it binds you. Courts take a dim view of this sort of restraint on trade.
That's true, but it might still scare the client / new employer off.
The non solicitation clauses are not about stifling employee personal growth. They are about protecting the organization from having its resources pillaged. It’s a reasonable protective instrument in my view.