It does show boost/favourite counts once you open a toot, and just like on Twitter you can also click to see the list of people who have boosted/favourited
The other parts are true, but the "manipulation of timelines" is just a question of time because it's useful if you follow lots of people. As long as it remains opt-in and a setting it's a good thing. I'm planning an ActivityPub implementation for myself and "manipulation of timelines" is one of the features I want to add the most for my own use.
Point being that deviating from a strictly chronological timeline isn't the problem. Doing so in a non-transparent way the user has little control over is.