IMO, indeed. You can posit a lot of numbers and create strawman arguments (cost, bulk) but I do not see any convincing reality-based arguments about the fundamental differences between 2 channel and multichannel. Some of it is fundamentally wrong:
Same old, same old.
Kal
It's roughly the same audible information (15% or 20% at most of the live performance) of the 2-channel but now spread across more than just two speakers.
Same old, same old.
Kal