I have to admit, as a piano player, I can't disagree more with your evaluation, Sam. Whether you play a 61, a 76 or an 88 has absolutely NOTHING to do with what type of 'player' you are. There are many very highly skilled players using arrangers. They aren't doing it because they lack the skills to do backing with a WS. They use them because they can make professional sounding backing much FASTER than traditional WS workflow with an arranger.
Truth is, the so-called 'pro' arrangers like the PA3x and, apparently, the PA900 (because Korg apparently think it is spec'd too high for 'home players) most likely sit in people's living rooms far more than on some stage somewhere...
The point I am trying to make is that, for some unknown reason, if you prefer to play on a decent feeling 88 keyboard (as most pianists do!), you have ONLY the BOTL arranger to pick from. Let us not forget, there is a good Pianist mode that can easily be used by pianists to add complete backing to their playing... You don't NEED to be in split mode making simple little chords with your LH if you don't WANT to! So why do pianists, whether home OR professional, get such short shrift from arranger manufacturers..? What is it about their particular skills makes them need fewer features and sounds than 'regular' (hah!) keyboard players?
The piano needs as complex a backing as any other type of lead sound. I honestly can't for the life of me figure out what the size of the bloody keybed has got to do with ANYTHING...
Imagine if the shoe were on the other foot... as a 61 keyboard user, would YOU feel that it was OK to reserve the best features in the arranger line for ONLY 88 note keybed users? Wouldn't you feel, under those circumstances, that the arrangers' features had nothing to do with whatever size you felt you preferred to play?
Look at the T5... For years, everyone pooh-poohed the idea of a 76 note Tyros. Who on earth needed one of those, right?

Now look... the 76 T5 is doing very well, and may be almost as popular as the 61. I see no difference here. Why does a 76 PA3X make sense, and a PA3X88 make none? Why does an 88 PA600 make sense, and a PA3X88 doesn't?
I am sorry, but I don't see any difference between what the 'pro' needs, and what the 'home' player does. I know of home players that make a bunch of so-called 'pros' sound amateurish! Your skill level is nothing to do with whether you pursue it as a career. And your needs for good sounding backing doesn't change if you are playing at home or on stage. If you could use a PA3X61 at home, and can play piano, you could just as easily need a PA3X88. That Korg force you, if you DO like a nice 88 action, to play the BOTL is pretty much flipping the bird at you! I have a feeling a bunch of amateur 'home' players of little skill barely need even 61 notes! What's next? a 49 note arranger?
