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Never really understood this idea that a custom bike you'd have designed with zero ability to change your fit. What's the joke again, find any two bike fitters and you'll get four different fits? Either way even if your fit is good it can still change. It can change due to injuries - middling or large, due to seasonal fitness levels, change in bike usage - race vs winter training etc, changes in component setup as minor as pedal/shoe stack or stem angle, and god forbid you might need to one day sell the thing.
Custom frame. 10cm of spacers.