That's not really a problem, I can't see any manufacturer designing their own chassis in the lifetime of the current regulations anyways.
For what it's worth aero matching isn't actually BoP. It's just removing aero from the performance equation entirely and putting it all on mechanicals, a position some people would be in favour of for promoting drivetrain technology instead of esoteric wind tunnel developments. Not fond personally though, aerodynamics are still a big part of efficiency after all.
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