If it becomes true of Apple, it will necessarily become true in many other domains. Xbox, Switch, PS, etc. What about car computers? Not just the infotainment system, but the actual engine computer modules?
For what it's worth, the US Air Force has been burned in the past by having game consoles locked down.
They bought a bunch of PS3s to make a cluster back when the machines could run Linux, but Sony removed the ability to run a custom OS when people started to actually use it.
I think the military got a special contract for continued support, but why shouldn't that be a feature that is expected of any complex computing device?
People do also modify their car and motorcycle ECUs, it's called "chipping". Again, this is expected of a product that you purchased and own, and it's still illegal to operate vehicles that don't pass local environmental and safety inspections.
