Fediverse could absolutely do better on just that data, though I do want to note the really effective (or addictive) algorithms for TikTok, Instagram, Reddit, etc. work on a hell of a lot more data than that. Not just what you directly interacted with, but did you even just click on the link? Did you go to the comment section? How long were you in the comment section? What comments did you expand? When you follow a link or look at an image, how long till you go to the next post?
Like I said, there are ways to do better with what we have, but the “ideal” behavior is secretly fueled by a whole lot of extra data collection that gets distributed everywhere.