Keychain is a big one for me. In the past, Chrome used to support Keychain for their passwords, which meant I could sync all my secrets on any browser on any of my devices.

Why did Chrome stop supporting it? Seeing that they support more obscure keychain apps like whatever ships with KDE and Gnome, I suspect that it was not due to a lack in resources.

> PIN numbers from iMessage

This isn't actually a Safari feature but an iOS feature AFAIK.

I'm like 99% sure this works on desktop, too, if you've got iMessage configured.

It does.

It's an OS-level keyboard feature on iOS, but on macOS I think it's only part of Safari.

I don't really use Safari (for the sole reason called uBlock Origin), but something really nice is that Look Up displays a scrollable preview of pages/links.

I really miss that since it greatly reduced the amount of tabs I opened.