An ”Instance Layer” would be a linked copy of a layer, that inherits all edits.
Like a light version of ”Smart Object”.
Why?
- You make a copy of a layer, to mix it in with another blendmode. With an ”Instance Layer”, edits in the layer would not require to remake the copy.
- Reuse layer in different groups.
- File size will be smaller.
”Instance Group” is next step.
”Instance Mask” maybe?