I understand. I got a bit carried away in my post. That particular functionality - which you correctly interpreted - is really a whole different product requiring a ton of development.
My BIG Request that I buried in there was the “Rehearse” thing - though it’s not really a rehearse feature.
It would allow the STUDIO side to add things to the project while the Performer side LISTENED (only) in full fidelity.
And then, with a press of a button, the PERFORMER side could add something while the Studio side listened (as it already works), and so on . . .