the downside would be the stem flex more due to it's being set higher (do seatpost flex noticably? I somewhat doubt it).
Long seatposts put a lot of stress on a frame if its not designed for it. How this translates into a feeling of flex, I dunno.
@Smallfurry started
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Long seatposts put a lot of stress on a frame if its not designed for it. How this translates into a feeling of flex, I dunno.