May be we should only show the tracks in mixer tab for the part selected.
Also may be the Stereo Out can be zoned to one side and track belong to each layer, plus any custom tracks (groups) on the other side.
I have many layers on the parts, many of them are hidden to avoid the confusion in this image.
I also see we can have mixer tracks for Stacks also, but i don’t see mixer tracks for Tracks.
I see Tracks have its own inserts and send place
Some Inserts for stacks can be seen inside the stack itself
And rest of the stack tracks on the mixer track..
Layers, Stacks, Tracks etc. can have inserts/sends, then why not make it more user friendly GUI that will make it easy and more sense.