Right, but one of my points above is that AIs would quite possibly miss things or fail in general to make the comprehensive and sophisticated tradeoffs between efficiency and fragility on one side and inefficiency and robustness on the other. They could also miss cases where being less efficient is more fragile and being more efficient is less fragile. I really don't think leaving everything to AIs is a good idea, and having a whole lot of them could cause weird interactions to develop that would need to be monitored by humans.
Ever heard of reinforcement learning, AlphaGo, AlphaStar? AIs can already make that trade-off and rather well. AlphaGo was actually better than humans to play robust moves that cement its victory than riskier moves that increase the winning margin.
That's my point! Your personal AI (in collaboration with other AIs) can take care of figuring that out as needed. You don't need capitalism anymore.