So I think your points are valid. I also just want to state that pretty much every cardinal voter I know prefers STAR then Score then Approval. I'm STAR 5, Score 5, approval 4 (only slight preference of STAR over Score). But I think that resolves your concerns. It is just that in practice we find that Approval is easier to argue for and is good enough. From a personal stand point I'll argue with technical people about voting systems if we got approval but I wouldn't be an evangelist anymore.