Stereo (And multi-channel) is designed to allow listeners who cannot be at the venue to experience it in their home, and for this you need at least stereo. (Hence Arrangers promote stereo as they are designed primarily for home use) Pro keyboards don’t prioritise stereo, but instead talk about channels needed to achieve a particular result
Trying to create a live feel in a live environment is pointless, as it’s already live.
Bill
I am trying to understand your last statement. When one plays an arranger, "recorded" multi instruments are playing.
That itself (various instruments playing different parts)is not "live," correct? When I play a solo instrument either digital or acoustic, it doesn't really benefit from stereo, but when a lot of instruments are being played from an arranger or from an audio file, stereo does open up the acoustic space though it creates the"sweet spot" issue.