My rough guess is they needed the cadence directly in the unit for the L/R power numbers, it would also explain why they don’t just use torque variations like Wahoo and everyone else to determine cadence since it wouldn’t know Left vs Right. Though this seems like it would be a good fall back for cadence that could be done in firmware.
Now don’t get me started on the promised cycling dynamics stats that use this L/R power that still seem to be missing unless you use their Windows application or a Garmin head unit. If TR could access this it would be a great feature update to see my pedal smoothness, etc while doing the drills during a session.