For example, I see a suggestion to link displacement to material, but at the same time, even in Cycles itself, displacement is done in material, but it largely depends on the adaptive subdivision modifier.
But at the same time, we can copy both material and modifiers via Link/Transfer Data, as well as other methods of copying them.
If it were possible to transfer/copy displacement data in a similar way, it would probably solve a number of issues.
Submitted on AHA Ideas (VBLENDER-I-58).