We (the US) seem to have a "not invented here" syndrome towards learning from how other countries improve over our system.

I see this pattern repeat when I speak to people from (physically) large countries: Brazil, Australia, Russia, China, etc. It seems like the larger your country, the most culturally isolated that you become. Small to medium sized countries are more willing to look outside their borders for good ideas.

Seems ingenuous to me. Except when Tele-File was a thing, every time has been 1-4 hours of torture, hoping all the places that are required to send me forms have done so (on time & correct), hoping that I have filled everything correctly, hoping that some unknown change of requirements hasn't made my past experience with some section irrelevant or misleading, and sometimes wondering why for the exact same inputs as the previous year (as occasionally happens) I am now told that instead of getting $X back I now owe $n*X.

I sometimes end up plugging the currently requested info into 2 to 4 tax prep sites (discarding the highest results, unless the lowest seemed to come from a glitchy or confusingly-worded site), because even they can give wildly different results.