Straightforward question, FC...

Do these 'finished', shipping units play more than maj, min and a few 7ths in the guitar audio loops, or is that IT...?

Adding in the remainder of the needed 'basic' chords (chords that cannot be made by modifying an already recorded maj, min or 7th) seems a bit more than 'minor' addition to a 'almost 100% finished' product...
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An arranger is just a tool. What matters is what you build with it..!