These rules apply to all flying in Australia. What is practical for RPT is not always so for others. 2 pilots, multiple radios, east coast will have a lot more options for getting updates and inflight replanning than single pilot, single radio, 200 nm west of Mt Isa.
No-one is "trying to get away with not obtaining <in flight> updates". Sometimes it just isn't that practical - especially when you're handflying in the cockpit rather than sitting in an office on the ground.