Calling that an argument from assumption is fair. I am basing this on where I think the puck is going, but I don't think I'm wrong. The issues you mention are not unsolvable problems, and AI is very good at independently iterating and improving on an observable objective metric.

Reality is certainly bimodal today, but that's because as an industry we're lagging behind capability. We're in the early days of the innovator's dilemma S-curve.