Surprisingly the Korg Kronos has many of the features I mentioned and costs considerably less than a T5 and about 1/3 of your $10k quote. Granted a 15" touch screen, larger ROM, and dedicated audio inputs and outputs would increase costs, but not to the point of putting it into the $10k realm. Most of the features would be software driven and as long as the main processors had the power, they could handle the additional features.

What most manufacturers offer us isn't based upon what we want or need, it's based upon what's the minimum they can offer and still have prospective clients buy the product. You and others feel the T5 is the pinnacle when it doesn't even approach what technology has to offer today. As long as you and others accept what they are offering as ok, they'll get away with baby steps in upgrades.