Quite an interesting question - theories range from 0% to 100% and everywhere in between. Empirical evidence seems to be that >60% causes a collapse of some sort [3] since nobody serious is doing that. And probably a floor of 20% since Singapore operates at 15% but doesn't really try to field a military and is a micronation. Anywhere at 40%+ seems to have problems with industrial production and innovation. I'd suggest there is a sweet spot at 20-30% spending on uneconomic projects, although obviously if that number can be reduced then more spending on uneconomic things means more stuff for everyone.

If we look at the countries you suggest, we see 44% (Japan), 27% (South Korea), 16% (Taiwan), 26% (Chile). We see that GDP per capita improvement is worst in Japan [1, 2]. There is a bit of a link between high growth and low government spending. Of course, if a country is growing quickly and the government isn't spending much then government expenditure will appear low so we can't be certain it is causal - but we would suspect that fast growth isn't led by government spending.

My personal theory is we see economies grow, then people kill the growth and coast. The high-taxing economies are lovely places to live for a while, but are getting crushed industrially and have generally managed to get themselves into an energy crisis which is starting to have an impact on living standards. Coasting is a bad long term plan.

Until someone comes up with a number, we should at least experiment with zones of as close to 0% taxation and spending as can be managed without compromising the consensus essential services. That is the sort of thing China looked to be doing in Shenzhen and it worked wonders.

[0] https://en.wikipedia.org/wiki/List_of_countries_by_governmen...

[1] https://ourworldindata.org/grapher/gdp-per-capita-worldbank?...

[2] https://www.ceicdata.com/en/indicator/taiwan/gdp-per-capita

[3] My guess is if we look at return on capital that is around the point where depreciation starts to overtake investment. And the symptoms of wastefulness go from sluggish--or-arrested-growth to now-obviously-shrinking-rapidly.