E-3 which is like a H1-B but for Australians (from a free trade agreement). It is capped per year but has never reached the limit.
The H1-B has a lengthy application process, there is a maximum number of consecutive years you can be on one, there are more applications than availability, there's a transfer process, it is dual intent, and what else?
None of which are characteristics of the E-3, which is practically instant and infinitely renewable and expressly not dual intent.