Not trying to discount your mishap, but that is really a one in a xxxxx number failure.
We constantly get mishap reports in and need to do investigations that lead to no action,,,,,or some action to minimize risk or even total redesigns depending on failure trends.
The number of 250/310s in the world that have done this is probably 1 (again that doesnt discount your personal issue, dont take me as a jerk just doing the risk math without true numbers data)
As for our x-lite external oil line (less is more, engineering) no need to have more engine case material for internal oil passage runs (thats the idea). I'm sure thats why we have this, many friends point to it immediately.
My "fix" bulletproof mod, would not even have stopped this ripped off issue. My mod is a split fuel line hose secondary doubler cover ziptied over the whole thing from the back of the fittings to just protect the line from impacts and or sharp cactus or branch pokes (we also do alot of bushwack rides).
I did see that the CH Racing factory Husky 250/310s all have had filter cover guards (same like Clay's type) over them for last few years, so they addresssed some of the potential issue, racing=minimize potential failure/damage spots=bullet proofing.
Anyway again we are all sorry for that one big $$$ mishap, but I would chalk it up as one in a mil thing but would do everything to minimize that risk . Hose doubler, good coverage skid plate with possible addition of filter cover as outlined above. (Good post-oil line torn off sucks!!)RN
on my machine good coverage skid plate
CH Racing "factory" WEC racer with oil filter lower hose cover
on my machine line cover/doubler. (most of it anyway) before I installed the heavy skid plate.