I think the point remains. Even those people should have much more reactions (likes and zaps) towards the people they actually like. You could, in theory, take this a little further with Sentiment Analysis but it might be too intrusive for the ethos of NOSTR.
As far as UX, it could be a small tag that I choose (only I see it). Different icon for three or so kinds of “liking” someone. The color of it could be a spectrum that parallels the “score”. Then the clients have those tags (for the users who choose to add them) and that allows to give back a prediction in the same form of icon and color back to user for the people they don’t know.