We've got to get over this...

A diminished, sus4 or augmented chord is NOT, I repeat... NOT a 'complex' chord. It is a basic chord.

A min(maj7) chord is a complex chord. A 7#9 is a complex chord. A 7#9,13 is a complex chord.

If you play tunes without a dim, sus or aug in it SOMEWHERE, you are not playing the right chords!
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An arranger is just a tool. What matters is what you build with it..!