If I were to steelman the usefulness of the argument, I’d say the conclusion is that positions on economics shouldn’t be indispensable parts of a political movement, because that makes it impossible to reason about economics and check whether that position is wrong. Which is just a specific form of the general argument against identifying with object-level beliefs*.
*For that matter, one should perhaps be careful about identifying with meta-level beliefs as well, although I don’t know if that’s entirely possible for a human to do, even discounting the argument that there might be conservation of tribalism. It might be possible to reduce ones’ identity down to a general framework for coming up with good meta-level beliefs, and avoid object-level
Interesting: He makes the argument that progress in physical areas of technology (transportation, chemistry etc.) has slowed in part due to government regulation (which would explain why the computers and the internet have been the one thing progressing drastically). But the United States has never been the source of all or even the majority of the worlds’ new inventions, so an explanation focused on the U.S. government can’t fill that large a gap (although, I suppose a slowdown of 1/3rd or even more would be explained).
Any information on what the situation has been in other countries? I wouldn’t be surprised if the entire First World has trended towards drastically more regulation, which would indeed leave only the places with fewer inventors and little capital to invest or consumer-money to spend able to experiment with technologies in those fields (if true, the implications for the chance of changing the situation aren’t as bright as if it’s just the United States). Still, this is something that has to be remembered in any discussion of technology, or for that matter any questions of this type. More generally there seems to be a general lack of tendency (among Americans at least) to check on or be aware of other countries in all sorts of questions, and the few times they are brought up it’s usually a single anecdote to reinforce the speakers’ point (but even these are less common than one would expect). That seems to be a serious impediment to actually figuring out problems.