I agree to a certain extent. If it was a concert and people were sitting listening attentively. Stereo.
In my living room, car, mp3 player, stereo.
For a party, bar or restaurant where people are moving about, eating, talking, dancing socializing, being entertained I'll never be convinced that it matters.
I've never heard of anyone complain about the lack of stereo at their event.
So my conclusion, is stereo sweet? Sure is!
When someone calls to book an event do they ask is it stereo?