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@gbj_tester
Design inertia.
Until Look actually measured stuff, people assumed that running the rear tyre tight in the seat tube cutaway was the most aerodynamically efficient position. After they published their findings, you saw a lot of people with other frames suddenly leaving a 10mm gap :-)
Same with clearance around the tyre at the fork crown - it used to be tight until somebody actually bothered to ask why, see my earlier post of UKSI/Trek/Look forks with big spaces for the air to pass through.