Fortunately, Ian, Yamaha themselves decide every few years that their current model is not 'perfect' and, in fact, could use some improvement.
You are happily using those 'improvements' that, while you had a PSR3k, you were just as adamant that you didn't need. I don't hear you complaining now, and I didn't hear you complaining then...
And trust me, should Yamaha ever decide that their arranger users (who pay as much as their workstation customers) deserve as well built keyboards as their WS users, you won't be complaining in the slightest, then either. Whatever they do, apparently is just fine by you. So why not encourage them to do something that a large number of us here at SZ actually DO want? After all, if they do it, you aren't going to care either way...
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An arranger is just a tool. What matters is what you build with it..!