You really can not compare Korg PA2x with any other arranger. Not the T3 not the G70. The extensive sound editing and effects on the Korg puts it in a class by it self.

Perhaps the Audya was to compete with the T3.
May be they were targeting the T3 market that wants something that sounds good OOTB, limited or no editing and cost a lot.
And that would have been fine except that Ketron has already developed a much more mature musical market. The people who like Ketron also like Korg. And they expect a lot of editing, programmability and space for user content. If you notice, the ones who are giving Ketron the hardest time about the Audya are the ones who have a PA2x and are concerned with none arranger features.

If you put the Audya in the hands of someone who is on the level of a T3 they would like the Audya for its features. They may not like the OS, but feature wise, they would be content.