I think it's mostly about having to change long worn habits when it comes to operating a mixer, Fran...
I've got friends that went digital with Studiologic, Yamaha, Roland, Behringer mixers, to name a few, and most of them (fulltime gigging pros) said that they had quite a time getting used to not being able to grab what they want INSTANTLY. Some to the point of going back to analog. Some stayed.
They are great tools, but need almost a complete rethink in how you approach live sound...
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An arranger is just a tool. What matters is what you build with it..!