Hey! As it came up yesterday in the chat: I think the shortcut from beta to group nodes into a subpatch or rather a Process (like it’s called these days) is badly missed.
The UX is pretty straight-forward here I think - select nodes, Ctrl+G and then a process with all inputs and outputs is created on the definitions of the document.
In my opinion it is also a great narrative to introduce the definitions side, by explaining where the process has gone after grouping nodes.