Earlier quoted context omitted.
Not really comparable. A Windows 10 device can be both a notebook and tablet. iPads running the Sidecar app are still just iPads — they can't magically be used in a desktop mode, they're only providing a secondary display to a Mac.
Well, yeah, but I am talking about Sidecar plus iPadOS. Basically, all this is a catchup with Android and Windows.
It's still two devices, one of which having a feature that depends on another device.
The Android and Windows stories are different, those are about one device.