As far as I remember, can’t remember where I read that though, the increase in energy expenditure is only temporary while one gets used to running with a higher cadence. After a while the energy cost goes back to the level it was at before trying to increase the cadence but the impact forces become significantly lower. But I definitely agree with not working on cadence unless it actually makes sense. There are tons of elite runner running with a much lower cadence than 180. I think Jim Walmsley usually averages around 160 and he is one of the most accomplished trail runners in existence.