Crazy complexity
Its crazy how complex PCs have become. ARMs are not exactly simple with the TrustZone and similar stuff, but.. this is crazy. If you thought you understand x86 architecture... this is likely to prove you wrong. There's now non-x86 cpu inside x86 that performs a lot of rather critical functions...
https://eprint.iacr.org/2016/086.pdf
...and shows that SGX indeed is evil.