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Multics achieved security by building it into the h/w. That caused the h/w to be more expensive and slower. The system market these days is all about price/performance ratio and the collective decision not to include security as a performance metric.

[mikewarot]

These days all the security is already in the hardware, that's what MMUs are supposed to do, virtualize memory, plus protect the OS from everything else. There's not really any penalty to be had for security... plus, think of all the stuff like Virus scanners you can get rid of along the way.

I'd settle for a hardware enforced write protect on a microSD port that I could boot from... at least then I could get back to 1982 levels of security.