+ Absolutely false. Whenever you work for a company, you will gain knowledge that is their property - almost always. It doesn't matter who/what/when/how you work for - that knowledge is theirs. Even McDonald's workers are subject to private info such as operating details.
+ "For you to somehow by dint of experience BECOME employer property in whole or in total is a truly bizarre perspective."
Nobody is anybodies property. If nearly everything you know about a subject is a trade secret, then you obviously cannot use that elsewhere.
+ "If you can't own them forever as slaves then preventing them from freely applying their learned skills for a period of time isn't coherent and logical."
Would you children stop talking about slavery?
If your skills and experience are tantamount to trade secrets than you cannot use them elsewhere.
The idea that some company is going to let you in on their $1 Billion dollars and research, so you can walk across the street and hand it over to another company 'because you think it's your right' - is not coherent or logical. Put yourself in the perspective of the manager of that IP.