[prbs23]

You seem to have already made a judgement about IME and associated management processors by calling them backdoors. Intel doesn't put IME into their processors to be a back door, but to, as the name suggests, manage the processor. The fact that a malicious actor may be able to exploit the IME as a backdoor doesn't change it's actual purpose.

The fact is that modern processors/computers are so complex that it's simply not practical to build one without some kind of initialization and management processor or other programmable device. Intel, AMD, ARM, it doesn't matter. Any processor of this size will have at least one if not more management processors.

Maybe these companies could do better and release the source code of what runs on these management engines, and I would argue they should. But unless we want to go back 10 years in processor complexity and performance, the "Backdoors" as you call them aren't going anywhere.