EDIT: I don't know how I forgot about pinch to zoom via the trackpad. While my original question did start me down an interesting rabbit hole of touchscreen MacOS, I 100% agree that a lack of smooth pinch to zoom via the trackpad detracts from the overall user experience.
Still, even at 768p you get a bespoke layout for your device, since this is literally the most common resolution still (seriously). The pinch-to-zoom on mobile is only useful for the very specific case of viewing unoptimized content (mostly desktop sites) in a comparatively smaller viewport. It’s not even useful on mobile if the website is optimized (sometimes for worse, but still).
It’s a nice to have, but hardly essential. But people are saying it prevents them from switching, so I am curious why.
Edit: forgot to mention I had to tweak something to enable it on Win 10.
Edit 2: Why the downvotes?