Apple love to preach "the UI gets out of the way of your content" with each new redesign, but how true is that in practice? Let's compare the total height of the Safari UI with a toolbar, favourites bar and tab bar visible, across the three latest Mac OS design languages – Yosemite, Big Sur and now Tahoe. I've added a red line for emphasis.
It sure looks to me like the UI is eating more into my content with each redesign.
It’s not a big power user feature, and one typically doesn’t sit there using the touch screen for minutes on end. It’s more useful for dismissing alerts or quickly focusing IM windows. It’s just nice in small moments where you’re juggling multiple things at your desk or just sitting back down. Being able to not think and jab your browser window to scroll down a bit is a natural gesture, even on a laptop.