W. Reich famously writes:
Ego drive and object drive parallelism should more formally address this important area for injuries, but I'm not sure if that means the explicit creation of some amity drive.
It's interesting to speculate on the schizoid status of many analysts and how friendship may have been downplayed in its significance because they didn't want to reflect on a sign of their lack of health.
Also in philosophy there is a strong contrast between the importance of friendship for Aristotle compared to Plato.
I'll try to write more about this again....