My d2 travelled most of the well known outback tracks for 8 years. I never had one problem because I always did pre-embarkation checks on everything , several weeks before I went. I think I replaced every hose on that vehicle a couple of times whether it was needed it or not and became good friends with British Offroad.
I still do two extended trips into SA desert each year in my Ranger (which is really nothing more than a Defender130)and I still do the checks each time. Theres a turbo hose and an intercooler hose go soft , isn't there defer owners? I've done the Simpson and with the preparation was a doddle for the D2, but a fantastic experience.
So what I'm really saying is don't expect hoses to last 100,000km , that is rediculous and is probably why people come to grief. When I sold my D2 the guy was given a couple of plastic bags of spare hoses, which I had carried 'just in case'.
I haven't started my plastic bag spare collection on this vehicle yet but every time someone in their defender have a hose problem I go out and check mine.

