Sure, I agree, I guess what I’m trying to understand is why don’t they have even higher rates of skilled worker immigration?

Think back to what the person I replied to said about the economic benefits of immigration in general (again which I believe are true based on what I understand).

For that matter we can just say the United States offers temporary work visas for skilled workers through the H1B program. Case closed! In the case of maybe New Zealand or Switzerland they represent less than 1% of the global population, most of the talent lives outside of those two countries. Are they importing enough high skilled foreign workers? I’m not sure. Switzerland for examples seems very expensive to immigrate to and get citizenship. But I’m not an expert there, just what I’ve skimmed through online.

Or is there more to it?

I think I'm not understanding what comparison you're trying to make. I thought you were expressing some doubt about whether H1B, or temporary skilled worker visas generally, were beneficial for the host country. You asked, "why don't other countries encourage this specific type of immigration" and I pointed out that they do have similar programs. Now you ask "why don't they have even higher rates of skilled worker immigration?"

Japan's SSW program has close to 300k workers. The U.S. H1B program has about 700k workers, so by population, Japan's program appears to be a bit larger. New Zealand's AEWV program has 80k workers with a population of 5 million so proportionally that's much larger.