Maj and min (and a few 7ths) as the ONLY chords not replaced by MIDI...

That IS kindergarten, as far as I'm concerned. 'Not nice'?

'Not nice' is a feature that only CAN play these chords. I've played almost every kind of music there is. Pop, R&B, jazz, alternative, schlager, polka, ska, reggae, rock, latin, you name it, at one time I've played it. I can't remember ANY of those musics not needing more than maj and min chords.

Can you?
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An arranger is just a tool. What matters is what you build with it..!