The productivity paradox isn't disputed by any mainstream economists. What is debated is its exact timing, size, and exactly which parts of businesses are most responsible (i.e. was eventual growth mostly about computers improving existing processes, or computers enabling brand-new processes like just-in-time supply chains)? The underlying concept is generally considered sound and uncontroversial.

I don't really understand what point you're trying to make. It seems like you're complaining that CapEx costs are higher in GenAI than they were in personal computing? But lots of industries have high CapEx. That's what investors are for.

The only point I've made is that "95% of organizations are getting zero return" is to be expected in the early days of a new technology, and that the personal computer is a reasonable analogy here. The subject here is companies that use the tech, not companies creating the tech. The investment model behind the core tech has nothing to do with the profitability of companies trying to use it or build on it. The point is that it takes a lot of time and trial and error to figure out how to use a new tech profitably, and we are currently in very early days of GenAI.