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It’s probably more to do with the fact that I have adjusted my drop bar riding position for a couple years and have a very comfy position on the bike but have only rode my mtb a dozen times and when you’re out of the saddle often, it’s difficult to know how to micro adjust in the same way. Also my seat tube is too long for the only seatpost I have for it (a dropper) so it’s slightly too far extended at full extension which is gonna give me knee troubles on a 2 day ride
It’s more the comfort factor. I can ride my gravel/road bike all day, the mtb not so much