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I am not an expert, but I believe this falls into

 

one of those  instances where while one solution (free-sprung) offers at least a theoretical advantage (a more perfectly-formed hairspring, no regulator to get knocked out of position), in most practice there is a huge overlap with the performance of other well-designed and executed solutions.

(the above notwithstanding the universal(?) use by Rolex of free-sprung balances, a great endorsement in my mind)

As a lover of chronometers, I have several examples of watches designed and elaborately adjusted for accuracy and isochronism, and All of them (Patek, V&C, Omega, IWC, JLC, various marine chronometers) use a regulator.  Except for my Dufour Simplicity.

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