Mobile is not a squeeze of the desktop layout

On desktop, you've got a sidebar. On mobile, most sites just shrink that same sidebar to fit a 320px screen, keep it a sidebar, and call it "responsive." But that's not actually responsive, it's just smaller.

A bottom sheet is the right call here, and not because it looks more app-like. It comes down to where people's thumbs naturally rest on the screen. The thumb touch point matters: controls someone reaches for most often should sit within easy thumb range at the bottom, not up top, where they have to shift their whole grip just to tap something.

Take a look at the desktop and mobile versions below. Which one actually feels built for how you hold your phone?