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Because what do you do when you're riding in the Outer Hebrides and your seatpost breaks and the only bike shop for miles has 27.2mm posts and no toppers? Your options are to cancel your holiday, sit straight on the mast, or buy a new frame. What about if you've just bought a nice new 27.2mm dropper post that you want to put on your gravel bike? You can't buy this Trek.
Gravel bikes are supposed to be practical; niche parts that no one sells or owns are not practical. The bike industry hasn't brainwashed me, they just have a real problem with constantly inventing new standards.
@Ricochet I guess, if the topper is necessary because of the suspension, it sort of makes sense. I wouldn't buy it though.
Because it’s cooler. Why is that any worse than a 27.2 post. Cycling industry has brainwashed you