I wonder how many pilots of aircraft flying in uncontrolled airspace know what separation criteria to use, how to establish same, and how to co-ordinate this with the pilots of any other aircraft that might be in the vicinity.
The only times "loss of separation" incidents occur (or rather, are reported) outside controlled airspace seem to be when TCAS has "saved the day".
When there is no conflicting traffic, I'm happy as, and have flown many times IFR as a pax in such situations in the past. Outside controlled airspace, and beyond radar coverage.
Of course, slightly different situation in the Antipodes, I guess.