I mean they are shocks sold for an enduro bike, and the bikes (and shocks) are being used for the purpose for which they were designed. Seems to me like its product not fit for purpose.
Why guess about what part failed
It/they failed. Full stop.
Same as a lot of shocks fail with HARD use.

The GS is, at best, a dual-sport bike and one with a road-bias at that IMHO. But even if it isn't, mile after mile of rough and washboard surface would take its toll on any shock.
Greg
how many shocks have they changed on the pajero - or whatever support vehicles they have this time ?
answer to 3 decimal places - 0.000
how many shocks have they changed on the pajero - or whatever support vehicles they have this time ?
answer to 3 decimal places - 0.000
What I still dont understand is why change the OEM shocks in the first place? What's so good about the Ohlins shock that makes it better than the OE BMW shock? The Ohlins website www.ohlins.com does a shit job of selling them too you.
All this shock failure stuff seems pretty crap. I mean they are shocks sold for an enduro bike, and the bikes (and shocks) are being used for the purpose for which they were designed. Seems to me like its product not fit for purpose.
how many shocks have they changed on the pajero - or whatever support vehicles they have this time ?
answer to 3 decimal places - 0.000
GS an Enduro: I think not. And I certainly dont think BMW have ever made such a claim.

Mate, what are you smoking? Haven't you read the brochure for the GS, or even looked at the bmw-motorrad website? It's listed in the web site under the, err, enduro category. The GS is quite categorically sold by BMW as an Enduro bike! The claim is there, right in front of you...
Now, back to the fit for purpose argument...
Buy a Jap 600 and you would be looking at a lot more than just a shock by 20k.
Compared with an R1

Funny you should mention an R1. I know of 2 that have gone RTW - one of which belonged to Nick Sanders and was unmodified and IIRC required no replacement suspension and nothing more than basic servicing for the entire 20k mile journey.
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The Nissan Patrols did get suspension upgrades (not done by the LWD team!!)
Video here - click on the text then on 'Modifications'
Greg
And Sanders rode on similar terrain on his R1 that Boorman and Mcgregor did?
So true - just no comparison at all.