> On the other when the employee is a top level executive who knows all the company's trade secrets and all their plans for the next year or so and they want to go to a direct competitor it is hard to see how they won't use that information at the competitor.

Since this is a steelman, what is the rationale for this dynamic needing to be protected? If this employee wants to go to a competitor because they they are getting a better employment deal, why not just try to keep them with your own better employment deal?

Why does it need some forced restriction? I know people aren't perfectly rational market participants, but what besides financial compensation or an enjoyable work environment would compel someone to go to a competitor?