Not just macOS: "The command palette is bound by default to ctrl+shift+p on GTK and cmd+shift+p on macOS."
> The command palette exposes almost every available keybind.
> This has some immediate benefits, namely that you can access keybind actions even if they aren't bound to a keybind. This is useful for infrequently used actions. ... For example, I personally find myself using the move_tab action via the command palette frequently, but not frequently enough to justify binding it.