Hey, I tried, I mean I tried really really hard.
The way you got to look at it is if you sit a DAW user down if front of it will they be able to "Intuitively" work out how to do it all ? I don't think so ! In the video it's mentioned about the tracks arranged in a more "Intuitive" way with + but then when it comes to the clicking and double clicking of the drag icon and color change it says nothing about "Intuitive".

https://youtu.be/9rJuNoo7rqk?t=139

https://youtu.be/9rJuNoo7rqk?t=335

If they are going to stick with this method at least add an option in Prefs to have solo, mute, track name drag export.
I think the idea hasn't come from sitting down working in a DAW day in day out in the real world.
But who knows maybe there's a big plan to implement a full mixer in it soon ?????????