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@DFP
I reckon its something to do with them being early adopters and willing to invest in stuff that works well. The hydro rim brakes probably became popular way back when they first came out, not just amongst trial riders but tourers and commuters etc. And if something becomes really well known and works really well, there is not too much incentive to switch to a new system which is perhaps more finickity in its own right.
If they all had to switch to disc brake wheels, they would need a new bike/frame, and having hub gears and dynamo hubs would become more complicated.