Since Qualcomm and Intel are the baseband/modems manufacturers and Apple has little or may not have anything to do with developing these x86 baseband modules, this should be mostly Intel/Qualcomm responsibility to tighten up the security, no? It's like we can't fault Boeing for the plan crashes if it's a CFM56 engine failure, right?
I don't think the CFM56 is a good analogy here. It does not appear to have been designed to fit the bolt pattern of a Cesna 172.
The main thing the x86 instruction set has going for it, is backwards compatibility. (Including the fact that there are a lot of highly optimized CPU designs around that instruction set.)
