I think the original idea of grid frequency maintenance is when clocks were purely mechanical before the digital era. They of course were just synchronous A.C. motors that were terribly inaccurate without the synchonization to the power grid's frequency. This also was before GPS and sophisticated devices to reference to. The only concern to electric utilities today is synchronizing the generators when bringing them online to avoid motoring...but that does not require any great frequency tolerance since it is all relative....
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