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Am I right in thinking that what you're really leaning towards here is that yoga classes > bespoke frames?
"You don't need a frame that fits you, you need to learn how to fit your frame..." or BFAD?
At any rate we're getting off topic... I suspect pal in Brussels just needs to go into whatever the spendiest LBS is nearby and find a suitably greasy salesman to tell him which aero whip to buy, he most likely doesn't want actual advice from lowly cyclists such as ourselves.
They are also designed to satisfy the needs of a huge spectrum of individuals rather than a bespoke bike which is solely created to fulfil the requirements of its owner...
Who am I to advise though, I own a MGOF Koga Miyata and a big brand HHSRB S-Works, neither is worth £10k ...