To me, it's a way to quantify how other people feel about my own positions. It's neither good nor bad to be upvoted or downvoted. People have unpopular takes sometimes and you shouldn't stake your identity on the amount of upvotes or downvotes you have.
Instead, upvotes and downvotes are most useful for other people to guage comments. Generally speaking, if a comment is universally downvoted, that likely means the position is unpopular enough that it adds no value to a discussion, and is therefore not worth engaging with.
I consider it to be a system built upon mutual understanding - that you don't have to seriously engage with everyone's viewpoints, and conversely, that nobody has to seriously engage with yours.
It becomes a problem when upvotes and downvotes are gamified like on Reddit, because Goodhart's Law demands that it stops serving its purpose when people are only attempting to optimize their upvote/downvote ratio.
I use Reddit through Relay and it's gone now. Even if I want to use Reddit, I have to jump through hoops to use it.