It both predates the Apple approach and is more thorough. I cannot inspect or ensure the software BoM of my image with Apple’s approach, I just have to trust them. With Oak you have trust down to the hardware.

> When on-device computation with Apple devices such as iPhone and Mac is possible, the security and privacy advantages are clear: users control their own devices, researchers can inspect both hardware and software, runtime transparency is cryptographically assured through Secure Boot, and Apple retains no privileged access

Waitasec - ZOOM AND ENHANCE!

> users control their own devices

I’ll believe that when Apple lets me downgrade my iOS version.