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Well, uci legality has never really been an issue for most people who race cross :)
Practicality is a key concern tho
And rigid lefty has no upside to offer to balance against the downsides of requiring special hubs, having to remove ya brake caliper to get ya wheel off and the ride offered which I suspect is going to be very unforgiving compared to a modern carbon fork.
Still I can see why they've done it - slate is a bit lame without a killer feature, whether it makes sense or not.
Reliability and endurance. What's the point of a road bike that has a 40 hour service interval on the shock?
And on that point:
New Habbit SE gets a Pike; fucking obvious product speccing for what is supposed to be a bike for megalolz not lyrca XC hounds.