No, that's what the 'favorite' link is for.

Favourites are public but upvotes are private, which might be a reason to use the latter.

No, favorites exist for a reason

They are public though

No, I bookmark comments with Pinboard¹. I periodically clean up by bookmarks and delete the ones I no longer wish to keep.

¹ Not a recommendation: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

No, I use browser bookmarks which eventually get sorted and migrate to a kanban or a bookmarks bar. It’s unlikely that I revisit something outside of this path.

Yes, that's basically the only thing I use upvotes for. "Favorites" are useless IMO, since you can't access the "favorite" link from the front page.

I upvote too many comments for that to be useful.

I never thought about it this way, but it is nice and interesting browsing my upvote history. So probably in a subconscious way - yes.

no. there is the favorite function for a reason.

or actual browser bookmarks.