I think a digital accordion's strength would be if they made them as light as possible, but no outboard (so you can use wireless). Well built, but light (maybe about a nice 48 bass weight) but with all the bells and whistles that Roland have.
Maybe, for those who use accordions in rock/blues type situations (with a whole band), a smaller physical sized digital accordion (like a 48 bass, smaller keyboard) could be used, and maybe use D-Beam to transpose keyboard up and down an octave for greater range.
I think I would love something more that size, looks WAY cooler than pumping a big ol' 120 bass..........
An arranger is just a tool. What matters is what you build with it..!