Earlier quoted context omitted.
First off, noncompete agreements and nondisclosure agreements are separate things. I don't see anyone here arguing that an employer's proprietary IP does not deserve protection. Secondly, while there do exist well-compensated noncompetes for executives and other high-value employees -- and I don't think anyone here is arguing against those either -- the vast majority are not compensated at all, except that the employ…
Since you can't lobotomize someone when they quit, it's impossible to prevent someone from using proprietary knowledge and insights at their new job, even with a nondisclosure agreement in place. IP transfer doesn't always happen in a way that's overt and easily prosecutable, like stealing confidential blueprints or explicitly telling your new employer trade secrets.
Still, there is a little truth in what you say. But we in California think that that is a price very much worth paying in exchange for the more vibrant economy afforded by outlawing noncompetes.