Not everything needs to be quantified, but at the very least this sparks the intention to be mindful of how you interact with others, and how you allow them to interact with you.
I share your opposition to quantification for things that are so deeply human, but without a number scale or strict ranking, I suspect that if we asked ourselves whom among our group of friends we seek out for support and uplift there would some that immediately come to mind.
The goal is to know who those people are and spend more time around them. In a way I think this is the opposite of quantification.
I really don't like the idea of trying to rank my friends like this. Not everything in the world needs to be quantified.