Re: "enabling manufacturers to lock you out of the devices you bought...."
There was almost an Eu ban on using after-market motorbikes parts in europe, even proposing you could only fit manufacture's own tires. All in the name of safety. It only fell apart when it turned out to have been written with very close assistance of a certain Bavarian Motor Works company
But you can't imagine the new friendly non-monopolist Microsoft/Apple wanting a ban on Linux outside their own carefully billed data centers