This is cool!
It's kind of similar to what the RICE/ICE frameworks are trying to help achieve [0].
We built some scoring of impact/effort into our tool Kitemaker [1] and allow teams to prioritize their work by these things. We ended up going with really simple scores like S/M/L since it's super hard to know the difference between a 6 and a 7 (and it probably doesn't really matter anyway).
0: https://medium.com/glidr/how-opportunity-scoring-can-help-pr...