+1

Why do I want more mixer tracks that support more RT's / RD's?
Mainly for this reason! Since there are no specific parts for intros, outros, bridges, breaks / fills etc...

If more mixer tracks are present that support RT/RDs you can use these to bring parts of completely different styles or elements to build these "missing" parts of song structure.

Unfortunately new "Utility" tracks will not do that.

Given there is already a huge accumulated library of RT/RD's, I think only additional mixer tracks that support chord/bar changes will give a choice of variation and familiar workflow to build stronger and more creative song structure.