Can we talk about . . . IQ? All other things being equal (which of course they aren't), it's better to have a high IQ than a low IQ. In particular, IQ is evidently the best predictor of academic success. There are other factors, however, that determine whether one is a 'success' in life.
Where it matters, though, is at the level of societies. According to this website, the average IQ in the US is 98, whereas in Japan and China, it's 105:
https://worldpopulationreview.com/country-rankings/average-iq-by-country
Why does it matter? Because the future belongs to those countries that can understand and create science and technology, what we call The Modern World. Low-IQ societies will never understand these things. The higher the average IQ in a country, the more it will be in that top tier of countries that are creating the human future.
We need more and better scientists and engineers. Our immigration policy should favor these people, and in general we need to appreciate the importance of highly intelligent people-- particularly those with a high level of mathematical/logical ability-- as opposed, for example, to meaningless Hollywood celebrities.
