So we should lobby for legislation that stops hardware drm in its tracks. Or makes it comply with society interests.

That's not very realistic. Besides, the technology that would enable something like hardware DRM also has some legitimate uses in security. The same tech can ensure that your banking app isn't compromised even if the OS itself is compromised.

A law that mandates that code signing can be done only by the owner solves that beautifully. As a bonus it kills walled gardens.