I want to get more comfortable playing a wider variety of chords voicings, so recently I've been playing around with lots of different chord progressions in my warmups. A pianist I like put out a video on practicing 2-5-1's, so I decided to check out what she does, but there's a bit I don't understand:
She chooses to replace the 5th of some chords with 6ths - what is the purpose of this? Why can/does she do it in some places, but not others?
For example, she voices some one progression like this:
Dm7, she plays D + FACE / 1 + 3,5,b7,9
G7, she plays G + FABE / 1 + b7,9,3,13 (Why not play D?)
Cmaj7, C + EABD / 1 + 3,6,7,9 (Why not play G?)