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what happens when you do that...
Oh sheeeit.
"Despite generous amounts of carbon paste and a textured seatpost surface, the seatpost kept slipping on the cobbles with the bolts tightened to spec. I checked in with Gerard, who told me to tighten it further. I did, the post made a couple of cringe-inducing sounds, but the post held from there on out."
Taken from here https://www.velonews.com/gear/road-gear/3t-strada-due-review/
Imagine you'd spunked 4k on a frameset and you're supposed to accept the cringe inducing sound of splitting your seat post.
@PhilDAS can tell you what happens when you do that...