A slightly different framing than openness that is used from time to time is owner controllable. Older x86 systems were underdocumented, but at least there was the hope of reverse engineering to replace boot firmware, limit device firmware and develop libre device drivers. Not so on today's OEM systems, the CPUs are coming cryptographically fused to only accept the OEMs boot firmware and with locked down, privileged, security co-processors.

I don't want to live in a world where everything new is an iThing that says I can't help you Dave. That could turn retro-computing from a hobby to an essential life skill to preserve freedom!