People are trending away from printing what they are going to say on their
slides. It would be useful if powerpoint automatically recorded your audio on
the day you gave your presentation. Then the distributed version of the
slides often sent after the meeting could synchronize the slides flipping
with a full audio track.
If it is a large meeting where you are pacing around the stage and not
standing at a podium with your laptop you may need a bluetooth microphone to
capture the audio properly. But for most business meetings it would be better
than nothing.