well, there's job based migration and then there are refugees, depends on what people are talking about.The refugee issues come from international law where different countries agree to be an entry point to receive and then redirect refugees all over the world. So the Sudanese might seek refuge in Egypt originally before being moved to Australia. There's a lot of cooperation and trading of responsibilities between countries (Trump famously got angry with Turnbull about taking our refugees). The Sudanese largely come from refugee programs from 20 years ago. So support is in place, but I don't think it was suffiicient and the mistakes of yesteryear are bearing consequences now as those kids that came as refugees are in their 20s and 30s and struggling.
Migration is about Australia trying to become immediately competitive in global markets and deal with skill shortages. Far more control there, especially being an island so there's no border to consider. To me, there's a tradeoff. We also need to be making sure that we are investing in our young people to compete in the workforce, by offering sufficient access to tiertiary education and TAFE courses. I think for the most part it's good, way better than what I saw in America, but it could be better re CSP places. I think retaining the "fair go" is essential to the Australian ethos of having an egalitarian society.
As for those that want a homogeneous culture, that's not my bag. I like having folks from all over. I've been hearing "spot the Aussie" from people for a long time, including family members, but I'm not on board with all that.