My browser has a half-inch white bar at the bottom constantly, presumably because of this setting.

Cannot reproduce on 26.2 with either Safari or Chrome with the setting on. That would infuriate me.

When first scrolling, the bottom page controls disappear. But they leave their container blocking the page content.

Using that option suddenly nerfed all my themes in Edge, forcing the window title bars to all be gray instead of the bold colors I use to differentiate the different profiles I use for work. I wish there was a “Reduce bullshit” toggle on MacOS and iOS, and also that it would skip all the increasingly stupid animations. No, reduce motion sucks because it just uses an equally-slow crossfade. Just STFU and let me move to the next task and stop animating everything. Good for you, you have a good GPU, I don’t care.