Well, anyways the event/competition is still there
Im not sure who was the creative one (smart one) to come up with such an event but non the less, im imperssed 
The dirt track sure looks fun… would be great to try riding in such conditions, so far with my somewhat weak 6s setup I’ve rode on snow and some hard packed dirt roads… not much hills though
The environment in the track looks rather dusty… I assume there needs to be some precautions to avoid the dust… this was actually one of the questions I wanted to ask - whenever dust has any bad influence on the motor or other electronics?
I know dust is pretty bad for computers… fans get clogged up and there is just a lot of ‘‘dust residue’’ on the circuitboards and components… usually these things have some sort of mask on top of them so im not sure how dust impacts direct physical contacts etc…on an eboard…
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So yeah some cover / protection for the motors does sound like a good idea… when taking into account / consideration the amount of sand dust there was in the air while riding 
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Thanks for the little background into the mechanics, your description of the ‘‘tube axle’’ does explain quite well why they might be more durable even if they are still hollow… but just with more material