Liam,

This may well be the case for a single instrument player or for a synth player who is playing single timbre notes. Even with a real piano, where you get some physical separation of sound, the amount of such separation is quite small, though definitely noticeable when you are close up.

The majority of people in this forum are playing Arranger keyboards, which simulate
the entire bands. When you listen to the band, hearing it from a single source sounds unrealistic They can not possibly all be in the very same spot physically. Having proper stereo separation goes a long way to adding realism to the sound of our instruments.

Regards,
Alex