I use one ear at a time, both for battery purposes, and so I don’t have the two AirPods communicating with each other through my brain.
I realize that we think nothing bad happens from the emissions from AirPods, but this may change in the future. Some have pointed out that prior studies involved devices that were not stuck quite so far into our ears.
Since I listen to podcasts and books, I have no need to use two simultaneously.