I did an 8 day trail bike trip through the Flinders last year on my WR450. There were 8 x blokes on bikes aged 32 - 59. We planned for months, had a backup vehicle, hired a sat phone always made sure we had UHF contact with the backup vehicle I he had to take another route, carried our own water and 1st aid kits.
Only 1 x day that 2 of us, the younger guys with proper enduro bikes, not tourers, went on a 200 km ride just south of Arkaroola. We both had an emergency plan, because we were a long way from any help. The other guys knew were we were going, and what time we would be back to camp. That day I nearly came unstuck in a creek at reasonable speed. I got lucky, and held on and stayed upright. I stopped, composed myself (read: emptied the sh!t out of my pants...) at that stage, I realised how remote we were, and how far away help was. I rode a lot more careful after that.
There is a certain freedom and feeling that one can enjoy when riding a motorbike in the outback, but that same freedom can become a world of crap when it all goes wrong!