OK, OK... I should have said 'changes'...
Chord substitution is supposed, if used at all, to make a set of changes MORE interesting, not LESS...
This kid is just tanking the changes, to make it easier to play. All the delicious diminished passing chords in the turnarounds are mostly gone, NOT substituted...!
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An arranger is just a tool. What matters is what you build with it..!