Tubular tires would only be more of a mechanical/logistical problem, as far as I can see. In terms of performance, it is going to vary dependant upon where you ride. In Iowa, yeah.....
maybe. In Kansas in the Flint Hills?
No way! Flint tears up a tire like a hot knife through butter as it is, and with tubular casings being fabric and not all that tough, you would be looking at a "when" the tire would get destoyed, not an "if" the tire would get destroyed.
Logistically it comes down to whether you have the space, or "want to" to cart around a spare tubular. Tubulars eat up a lot of space, so if you are a minimalist, or space is a concern, tubulars will cramp your style a bit.
Also, there is the whole removal/re-installation thing in dusty/dirty environs. Probably not conducive to getting a secure seal on a rim.
I would opt for tubeless with a tube back up and a patch kit for really long events. Bring a zip loc to throw your tubless valve stem into in case of a repair, and bring a rag to wipe up with due to the sealant mess. (Been there, done that)
In events like the DK 200, where flint rock is like knives, I just bring a tubed set up right off the bat, although you can certainly do tubeless there if you want. I just would rather by-pass a near certain mess due to a flat. At least for that place.
