Inviting controversy I'll say my piece - and like a previous poster I've also seen this discussion played out ad nausea on other forums for other instruments. People have their points of view and defend them. I also play the drums and the organ and have played many electronic versions of both; I've also used Roland accordions.
Thinking about all these electronic synthesisers, and not withstanding my view that the electronic accordion is a good decade behind the sound modules and interface of the best of other more commercially viable and bigger market instruments, there are two fundamental problems I've found with all synthesised sound.
For the listener: The basic technology of the loud speaker is a limiting factor. It doesn't move air with the polyphonic complexity that scores of individual accordion reeds, organ pipes or drum skins. These elements are all their own individual loud speakers and have a complex interplay with each other and the acoustic space they are played in. Somehow, and I can't apply science, electronic instruments can sound good, but somehow the ear tires of them after a bit despite all the perceived options, and they can struggle to touch the soul or convey profound musical meaning. For me, even in the hands of a great artist, they sound two dimensional too often.
For the performer: The interaction between human emotion, muscle and sinew of the performer with the wood, metal and whatever else the instrument is made of produces a complex dialogue between performer and instrument. You feel the instrument talking to you as you play and you respond and it forms a reflexive dialogue where you can really make music, which at its essence is the language of emotion. I'd go as far as to say a transcendental conversation as you feel every vibration physically and aurally as you and truly interact with the instrument as equals.
I was really into electronics and synthesizers when I was a teenager. You could do everything with infinite variety and novelty. What was harder was making music, really making music where the earth moves, or at least wobbles for a moment.