The issue is whether people exercise their rights "under the protection" of more powerful (but private) entities. For example, in some of the cases cited in the New York Times, courts acknowledged that non-competes were not to be enforced -- but only after the hiring company went to bat for their new staffer.

If someone enters into an unenforceable agreement, they should be freed of it speedily and inexpensively. Maybe the terms of the agreement are such that its' unenforceability is non-obvious; but it is ultimately the one bringing suit who should bear the cost of wasting everyone's time in that case.