2) Community notes (birdwatch) was already released before Elon Musk took over. Elon just changed the name and maybe sped up the availability of it that's all.

3) Reply and retweet numbers already gave a pretty good idea of how much a post was popular compared to others. Having also the view count would be welcome but the algorithm on how a view is counted is not clear and the numbers seem inflated, so in its current state I am not sure if it is actually helpful, other than showing ad providers some inflated numbers.

4) The text of the tweet itself acts like the headline now, which is even worse than having the headline. Also when you click on the image, it takes you to the page where you see the headline first anyway. So I don't see how removing the headlines helped anything. In my opinion it just made it confusing to differentiate images from links.