How does/should STAR voting work with only 1 or 2 candidates?
If the ballot has full 5 stars for just one or two candidates, it seems excessively complex. But inconsistency is also complex.
I may want to not use the full score range or specifically mark the single candidate with a low score to indicate disapproval etc. but that encourages not-as-good thinking about what the 5 stars mean and how to use them with lots of candidates. We don't want a ballot where most 1- or 2-candidate positions get people in the habit of low-ranking or otherwise being "bad to good" rather than "worst to best" for what they think the stars mean. That risks them continuing the pattern when a multi-candidate seat shows up later on the ballot.
If we want to get away from treating the stars as a good-bad poll but instead as use of 1-person-1-vote, maybe all seats with only 1 or 2 candidates should just be approval voting?