Unfortunately, that essentially contradict's the GP's "isn't a research problem anymore" assertion.

Similarly, millions, even tens of millions, isn't an impressive amount of money by VC-funded high-growth tech startup standards, so that also belies the notion that it's not just research any more.

Ford got past the R&D stage for the Model-T a long time ago, but they continue to pour money into R&D to make better cars. The same happens for energy technology. We have clean energy systems that can compete with fossil fuels today, but that doesn't mean we shouldn't keep seeking new innovations that make them even better.

Since the GP was a direct reply to the comment with that premise, asking about the kinds of work and technology, it seemed to me like a borderline-disingenuous to respond with something related to research and not mass scaling, especially since that response was "all of it".