I agree with about everything you said. The System&#x2F;38 design was one of the best cathedrals of old. Very forward-looking, thorough, consistent, and great for admins of the time. Still the only capability system bringing in revenue. Adapted pretty well to modern stuff but main OS&#x27;s issues &amp; stagnation hurt it as you said. I think the fact that it&#x27;s pricey and proprietary kept the OSS innovation out, too.<p>However, the change to the AS&#x2F;400 and POWER cost it one of its greatest features: hardware-enforced integrity at the object level. That&#x27;s the feature that would still be giving hackers hell if it was widely deployed. The Intel i432 APX and i960MX had similar property. Interesting enough, IBM actually has secure CPU&#x27;s they&#x27;ve prototyped and even sold to select customers. Would be great if they integrated one with IBM i at microcode, compiler, and OS levels. That plus an optional interface for new customers without legacy crap would be a huge differentiator that might give it new life.