I think making it personal like that would cause a great many more problems than it would solve. For articles, I upvote them as a means to "save" them. I think that's a more objective means to measure value: I vote on articles to serve my own needs (because I value them), not to express an opinion or agreement/disagreement. I have no idea what could be done to the system of voting on individual comments which would more closely align to that rubric.

I would rather not know if some individual is routinely downvoting me. There is no way to determine if such a pattern arises out of personal dislike/spitefulness or just coincidence that they see the world very differently from me and therefore just happen to strongly disagree with many things I say. But the ability to check for/notice such patterns would likely begin negatively impacting discussions here as it would promote "feuds" which likely would not remain confined to voting patterns. I've seen a few comments that suggest that there are running battles here between specific individuals, but you get that everywhere and it seems less toxic and less obvious here than what I have witnessed elsewhere.

For that matter, it also might not be a good thing to know one person routinely upvotes someone in particular.