I'm also 'exploring' Utility tracks as my latest Opus

requires 10 tracks so I used Utility for the extras
BUT AFAICT they do not show up in F5 so useless to me for 'arranging'. They don't follow shots or holds either, I believe.
So for now it's 2 separate SGUs and wav tracks from each to DAW like it always was.
Maybe 2022 will bring more 'usability' to what is a great idea.