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tl;dr Allegedly, Bitmain sold you a miner with a hardware feature (that it has control over) that enables 20-30% 'faster' mining for them, but not for YOU (as it is switched OFF in publicly available hardware).
That's kinda like condemning city streets (with a traffic light every block) for not having the same speed limit as the Autobahn.
While I have many issues with BM software, the truth is that it's not that BM turned it off on other pools, asicboost isn't written into most pools.