I think the yield-to-right ones are primarily a traffic calming thing, where the threat to yield limits how fast you can comfortably go through them. They use a

I think the yield-to-right ones are primarily a traffic calming thing, where the threat to yield limits how fast you can comfortably go through them. They use a lot of yield-to-right intersections in residential areas with poor visibility for the same reason. It's conceptually similar to the 4-way stops on low-traffic streets in the US, just streamlined and formalized.