x86 virtualization isn't perfect at all

QubesOS certainly has some good things going for it with isolation but the guest VMs which run traditional desktop OSes are generally much less secure than mobile OSes like Android OSes and iOS

Iirc it's not even possible to run QubesOS on hardware that has proper verified boot or non-meaningless secureboot.

With regards to security through obscurity, the Pixel firmware isn't obfuscated at all. It's closed source but it's easy to decompile the code and inspect it. They don't try to obfuscate it to make that difficult.