Of course I didn't mean any disrespect. "Guinea Pig" is a common phrase in the U.S. that describes someone who is, often unknowingly, used as an experimental tester. I often forget that such slang may not be known or understand by different nationalities. A Guinea Pig is a small rodent-like animal that was (maybe still is) used by scientists for experimentation.
Back to the subject: it has been my experience that Yamaha Japan does not communicate fully with Yamaha U.S. Our guys here at Yamaha U.S. seem to be caring, sincere and well-qualified, but they are at the mercy of the honchos in Japan.
That's just my impression, but it's one developed over years of "wait and see" answers after owning approximately 12 PSRs.
Most likely I won't worry about it anymore, since it is not my plan to buy any more, unless they come up with something that it far better than the other companies' offerings.
DonM