I think for most people, it is a hard decision. We returned in 2016 after eight years in Australia. There are things we miss, but overall, we are very happy to be home. I do think the way in which we did it was the best way. We made the decision on the Monday and I flew that Friday with my wife following a week after as we had to wait for the dogs rabies vaccination time. It removed the dithering which I think many people find stressful and although it was stressful selling all our possessions in a week (the house was already on the market) it meant there was a fixed line in the sand.
You will miss things about Australia, that is normal. But, we were also more amazed by the U.K. than we thought we would be. Things we had taken for granted are seen in a totally new light. All I can say is that for us, it was the right move and I doubt we will ever even visit Australia again.