There is a 100% chance that the status bar icons do not 'scroll'. Think about that for a moment. Casually look at your screen and imagine status bar icons scrolling up top. Have you ever imagined anything more distracting than that? Didn't think so.That HomePod leak from a few weeks ago had traces of a dynamic status bar system. The icons could very well show up depending on what you do or scroll around. Maybe we even get to pick what icons we want to have showing?
I mean I don‘t need stuff like carrier name (I got a flat that covers every possible country I go to), bluetooth (it‘s always on here... although I like the AirPods indicator), rotation lock (always on) and alarm icon (always on) to show. I can see why people want to have these showing though.