John,
Why are we never happy, don't the manufactures get it right
No, every user has different tastes and needs. Manufacturers can't possibly get it perfect for everyone so they simply provide their products with a setup that works for most.
But everyone is different otherwise restaurants wouldn't need menus to cater to taste ... they could just sell one type of meal that they figure everyone should like ... fortunately people aren't like that or life would be very dull and predictable.
Editing allows those that aren't happy with the standard factory setup the ability to tailor it to taste. Remember that the styles and patches etc are created by sound/style designers who may have different tastes from many end users. It doesn't mean what they setup is bad, it still is based on their personal taste. Some people will totally agree with their choices while some others will not agree. That is human nature. The other thing is that the factory setups are created on a very tight schedule so that marketing deadlines can be met. These designers do the best they can given time constraints as they familiarise themselves with the new technology. Traditionally the best patches available for all synths aren't those that it is first shipped with. That has always been the case. It takes time for sound designers to really learn how to tap the full capability of a keyboard.
Well off topic actually. The subject of whether users would ever want to edit their keyboard setup is a topic that really doesn't belong here. In fact it is really a very strange thing to question to be honest. I think you are the only person I have ever heard question the desirability of being able to tailor a keyboard to individual taste. Though manufacturers would really like to sell to consumers that accept corporate product decisions made on their behalf without question.
You yourself question manufacturer product decisions whenever you compare keyboards when you are going to purchase. From the sound engines, style choices, OS navigation, hardware choices, sound design etc etc If you truly believe manufacturers always make the very best decisions there would be no need to even play or listen to them ... simply walk into the store and just plonk down your money for the latest Korg, Yamaha, Roland product and walk away with it. But you know that is not the case, you evaluate all the decisions the manufacturers have made. And in the case where you don't exactly agree with them if you had the ability to modify you absolutely would. Though we all know there is nothing about your Audya you would ever want to change ... or is there?

You are welcome to continue this discussion but please do it in its own thread.