Please, make simple node groups like in Blender
select nodes, ctrl+G and you see a group node instead of a mess ,
you copy the group and get an instance , click a small number and the instance turns unique .
It might be not providing all that extra functionality SD promise but for every day work it's so, so much more easy and convenient to deal with.
I also love how Shift+D in Blender makes a copy right in place of the node , not in a center of view in the mess of orther nodes. I like cttrl and shift+stroke that clear a link or make a root node. Not SD way where root dot apperas in the mess of other nodes.
Like M node bypass command in Blender.
Please take a note of it , In many regards it so much more convenient
Already exists in the core functionality of Designer since inception. https://docs.substance3d.com/sddoc/graph-instances-sub-graphs-102400070.html