I have to disagree with your dreamer. It doesn't matter what the arranger is ,whether its Yamaha or Korg or Roland or casio .It's all about the creativity of the user what they intend to do with the instrument and how they use the instruments technical abilities to express their creative abilities .

Let's break an arranger down to its base components and take out all its musical content. What you have left is an incredible keyboard with brilliant realistic real world sounds. You also have a functionality that until quite recently no other keyboard has and that is the ability to prerecord sequenced pieces of music, bass drums guitars strings that will change chords appropriately depending on the chords you a might play. You can even program instrument to play back different sequences of notes based upon the particular chord variation that you might play, four example minor ninths, thirteenths diminished chords augmented chords etc . You can segment the song you want to compose into verses, chorus, beginnings, endings you name it if you can think it you can create it !

If Yamaha create demonstrations for old folks they can just as easily create ones for young folks . Using exactly the same instrument !

We need to stop relying upon how we see instrument demonstrsted in the hands of people are demonstrating for a particular market group. Look beyond that, and look at the actual potential of the instrument. Every time I do that and I mean every single time, I resist the urge to buy the next arranger because my current Arranger Is The Next Arranger if I have the imagination for it.