For non ERG-Mode sessions it would be a benifit for further ride analysis to have beside several other parameters also the gear combinations recorded. SRAM eTap provides gear combo via ANT+ and an extension should allow recording this data and provide it in the ride summary (to be uploaded to STRAVA or downloaded as *.fit file)
JM said recently they were looking to implement just that in regard to the new Wattbike which has virtual gears. It’s possible the same could be done for eTap