Well Kristoff apparently won't try tubeless again at Paris-Roubaix. Although it's unclear with the information given what pressure he attempted at P-R, or if the issue was truly specific to tubeless. I'm speculating he was pinch-flatting given the reference to "holes."

It's the paradoxical issue that lower pressure might given reduced rolling resistance and increased comfort, but increase the odds of a catastrophic flat. Josh@Silca wrote a blog post about this sort of assymetry where you go faster, faster, faster....then suddenly drop off a cliff.