Yes it has materialized somewhat. The UEFI and Secure Boot are not the issue here - neither is uBoot/fastboot on phones. The issue is who holds the keys - if it is the owner of the device, then great! But most laptops and phones don't allow you to set your own keys, just Microsoft's or OEM's, and that is what the issue is. Linux distributions work around this by either explicitly requiring disabling Secure Boot / Unlocking the bootloader, or having Microsoft sign a shim that they can use and using that allow the user to add additional trusted keys.