There are 77 distinct drum kits in my BK-9. Balanced so that, on the whole, you can change any one for any other, and it still sounds good (with the exception of ethnic kits with totally different mapping to GS). This gives the styles an incredible variety, and the user incredible opportunity to change them and make a style his OWN...

What software writer is going to be able to compete with that? Sure, maybe a few basic kits, brushes, sticks, rock, etc., but 77 of them?

There are 1,718 Tones in the BK-9. Now, not ALL of them with different samples, but a huge number are. What software maker is going to have the time and resources to compete with that? We have come so far from the old 128 GM sound set that it is ancient history. Well over ten times as many, now, in an inexpensive arranger.

I'm sorry, but I just don't see anyone with deep enough pockets to make something 'soft' that comes close.
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An arranger is just a tool. What matters is what you build with it..!