There is no counterfactual needed. Productivity growth has declined, despite the expectation that software would accelerate productivity. I'm asking you why this didn't happen.
There is a counterfactual needed because it is not clear whether the growth would not have declined even more without Software.
Again I'm asking - is there a single credible economist who says that the growth would have been higher without technology?
Of course a counterfactual is needed, absent clear separation of causes and links to effects, neither of which the productivity metrics on their own establish. This is also widely known and talked about in econ circles in the face of this very data.