You'll also find watchmakers and companies doing different things for different reasons. The Swatch Group recently and famously adjusted the ETA 2824 from its original beat
link rate of 4 Hz to
link 3 Hz in order to squeeze a greater power reserve of up to 80 hours out of it. After years of tinkering with the co-axial escapement Omega's watchmakers determined the optimal
link frequency to pair it with is the unconventional rate of 25200 vphbph.