Favorite is one of my most used features. Please don't remove it, dang! :(

I frequently go back to these stories, whereas I don't often care to find things I upvoted again. If the two features become conflated, I'll probably stop upvoting so that I can use upvoted stories and posts as a bookmarking system.

Please keep favorite stories and posts around.

If you're worried about feature utilization, maybe name it "save" for better discoverability. That's essentially what I use the feature for.

I don't trust or use browser bookmarks much anymore. HN favorites are high quality bookmarks that work across all my browsers and devices.