Well, I understand your opinion, though I don't agree with you.
> - The chain of trust becomes completely worthless after I decide to put a new operating system on my device. This limits my choice and freedoms as a user of a device.
Actually, no. If you just want to replace the operating system, you're good to go. Modern android phones display the public key of the kernel when booting a non-OEM ROM and bootloader has been re-locked.
(granted, pretty much noone does that)
> - The chain of trust becomes completely worthless after I decide to put a new operating system on my device. This limits my choice and freedoms as a user of a device.
Actually, no. If you just want to replace the operating system, you're good to go. Modern android phones display the public key of the kernel when booting a non-OEM ROM and bootloader has been re-locked. (granted, pretty much noone does that)