You don't understand Batterygate either, probably because it's been so misreported on Reddit.

Batteries cannot consistently provide max voltage as they age. In order to prevent your phone from shutting down randomly - say, during a 911 call - they make the processor stay within the minimum voltage that the battery can provide.

Yes, it should have been an option, but most customers should leave this feature enabled anyways if they want a stable experience and a reliable phone.