"No, you're right. Someone like, say, you, should get to decide, preemptively, what a contract between two parties should or should not be allowed to include. Because you know better than the parties actually doing the negotiation, right? Why should we trust that the relevant parties know what's in their own interests?"

When one party has far more power than the other, and the clause in question is only there to screw the worker over and prevent them from working in their chosen field? Yes. There is absolutely no reason why a worker would want one of these clauses. They get railroaded into them only because they need a job and don't have negotiating power.

Stop pretending that everyone has the same negotiating power.

"Yes, there are."

No, there aren't. A company is not entitled to make money. Especially not at the expense of someone being able to feed their family.