I was on a commercial flight years ago with an
active COM feed to the SLF headsets. Ours and
several other planes were picking their way through
a storm front and were continually requesting
10-20 degree right and left deviations to avoid
weather.

Sure. That's what the Garmin 396/496 is for. The big boys have on-board
radar, of course. When there are storms about the frequency is full of
such requests.