This is something that many other DAWs have which is a huge time saver. In Ableton, for example, its a bit different as a group channel and a folder are the same thing, whereas in Cubase they are not.
I’d like to see this option as a global preference at least, as there are of course times when you might not want to do this. But those don’t outweigh the times when you do. Building templates and such would be so less laborious without having to manually do this every time you move track around or change it’s type.
Drag a track into an Orchestral folder/the other tracks are already routed to an Orchestral subgroup/new track gets routed there automatically.