It's invasive and takes up valuable screen real estate. On top of that, it's very distracting to keep having an element bounce into view. I have a very hide time dealing with even minor distractions on my screen, personally.
I straight up permanently remove most sticky headers with Ublock Origin. 90% of the sites I read content on, I didnt get there by internal site navigation, I got there from a kagi search or HN link. The rare exception are documentation sites; I use their internal navigation often. Thankfully, though, very few of these sites use sticky headers. I just quickly scroll to the top or use the pagination buttons at the bottom.
I straight up permanently remove most sticky headers with Ublock Origin. 90% of the sites I read content on, I didnt get there by internal site navigation, I got there from a kagi search or HN link. The rare exception are documentation sites; I use their internal navigation often. Thankfully, though, very few of these sites use sticky headers. I just quickly scroll to the top or use the pagination buttons at the bottom.