A 76 key arranger with Balanced Weighted Hammer Action would be a failure. The whole point of having 76 keys is to give you more options and to be as versatile as possible. Such a keyboard would not be good from playing other sounds like organ, synth sounds and other non piano sounds.
Also, it would make the keyboard heavier than it needs to be.
Again It is not an issue of 61 vs 76 keys but and issue of big vs small, heavy vs light, compact vs bulky.
If Yamaha makes a good 76 key arranger Balanced Weighted Hammer Action when it fails then they would say a good 76 key arranger does not sell.
If you think other wise, ask Yamaha about sales of the S70 XS.
All we want is a DGX or Motif 76 with great arranger sounds and styles and features.
But because of Yamaha divisional rivalry, it may never happen.
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TTG
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TTG