There’s not actually that much of a safety net. And the figures quoted below are largely unchanged 4 yrs later.

https://www.smh.com.au/opinion/miserly-newstart-keeps-unempl...

I think the real issue with sustained high levels of immigration is that most immigrants end up living in one of two major cities, Sydney or Melbourne. Melbourne is on track to have a London-sized population by mid-century - but that’s of course based on estimates. Which as the article points out, were completely wrong by three decades in 2005.