We should have the ability to run any code we want on hardware we own

I think we really need to discuss whether IP/copyright protections were a mistake. A LOT of our "modern" problems stem from IP protections. Whether that be not being able to own media, right to repair, DRM, censorship, a lot of monopolistic behavior, medicine prices, etc. And no wonder, IP protection is government sanctioned monopoly, and it is generally recognized that monopolies are bad; is it such a surprise that government enforced monopolies are bad?

Not really sure what this has to do with running your own code, though.

If a manufacturer makes a device locked down, it's the technological protections preventing you from running your own code. Not IP/copyright. Sometimes they get jailbroken but sometimes not.