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So in this case it's the other way around, you reduce seatpost flex at the cost of frame stiffness. So it all kind of equals out except the anti-compact geo of the Mash uses a lot more material which adds unnecessary weight which means Mash is still fail but pot holes aren't more of a hazard.

No. Less stiff if anything.

This explains the main motivations for compact geo.

Not mentioned is the slight comfort benefits you can get with a long exposed carbon seatpost.