Kamikaze
IMO this is what BandLab needs to do...
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Some very good points made here! The focus on the core skillsets of Sonar is a must.
Mixing, Arranging, Sequencing and recording
If it isn't something that Sonar can do as well, or better than the competition, cut it out. Harsh, but necessary to avoid a jack of all trades mediocrity. Sonar needs a strong identity to appeal to the future uninitiated DAW users, or else the competition will win.
As far as the Matrix is concerned. Nice idea, but Live can do it better, so just let it go.
Same with chord tracks. It's a nice idea, but Cubase can do it already. It hasn't happened in Sonar yet, so just let the feature request go in peace.
Notation? Get a dedicated notation program. Studio One and Live are both successful without a notation view.
Trim the weeds, and focus on areas that are the strongest!