> Like going to work for McDonalds R&D after leaving Burger King as the VP of product design.

Don't rightly see why there would be any issue with that. If you bring McD IP to BK, then that's an IP theft issue.

> I once worked for a major bank and someone who left another major bank held a meeting with developers of a next-gen platform where he basically explained, in explicit detail, his old employer's entire platform. I would argue a non-compete would be 100% enforceable here.

And I would argue a non-compete should be 100% non-enforceable here. "I learned shit on my previous job" doesn't mean you should not be able to work in the field anymore.