Disk images don't work with Macs any more. Apple has forced us onto 'workflow-based' installations which are supposed to ensure firmware for all subsystems are installed as well, by running the OS installer every time. However, this is pretty time-consuming.
You really don't have 'complete control' of Macs any more. Apple do what they like with your hardware.
You really don't have 'complete control' of Macs any more. Apple do what they like with your hardware.