As was pointed out earlier, Korg are using the keybed from the Korg SV-1 73. This was a product brought out to answer the success of the Nord Electro (also in a 73 size). The thing is, these products are aimed quite squarely at those that are infatuated with the retro, Rhodes Stage emulators so popular right now. I don't know if you've noticed, but retro keyboards are all the rage with young players these days. Wurlitzer EP200's, Fender Rhodes, Mellotron's, old analog and early digital synths, I think because they aren't the current 'black slab' look of WS keyboards, with little stage personality, they make you look 'cool' onstage (where 50 year old guitar designs still dominate too!).

The trouble is, once you get away from wanting to emulate an old Rhodes, the loss of keys is simply a fashion, not out of any practical necessity. Ten years ago, you would have found room for a 76 if 61 wasn't enough and 88 was too much... simply because that was all there was!

Korg are saving money by using a keybed designed for a stage piano for a product that has nothing to do with it..! Look, there was a GOOD reason we moved AWAY from the Rhodes73 layout. More notes is a good thing.

I'm sorry, but I really think that the width of the product is the LAST thing on Korg's mind when they make this decision. They are simply saving themselves money be using common components in utterly different products. But a MUSICAL need for less? There isn't one!