1) that's mostly mining, or oil & gas, or the like and usually needs bodies on site. NOC folks and developers aren't flying to Outer Nowhere to type C# in a poorly air conditioned sea-can.

2) FIFO is rarely 2 days in office 3 at home, it's 2 weeks on site and 1 week off -- or similar. Many day stretches. "once a month, etc." is far more common.

3) FIFO to major cities like Perth is more workable simply because the airport and infrastructure are there. It's a shorter flight to somewhere like Carnarvon, West Australia, but they literally don't have the aiport size or housing capacity.