The Magic Keyboard accessory turns the tablet into a touchscreen clamshell notebook with a cellular connection and iPhone caliber cameras. Unplug the external display and pull the iPad Pro off the Magic Keyboard to use it in tablet mode for holding the web in your hand as you surf, or see friends and family with the best FaceTime experience Apple offers.
Apple is comfortable advertising the iPad Pro on its own and with the Magic Keyboard case, but you won’t find images of the iPad Pro connected to an external display for anything but basic video-out features that were introduced ages ago. There’s serious practicality of using an iPad Pro as a desktop computer that can shift into a notebook and a tablet already, but iPadOS doesn’t make this capability marketable today.
Imagine Apple introducing proper external display support that adapts the layout to 16:9 monitors without pillar boxes. It could even extend monitor support to work as second screen when paired with a keyboard and mouse or trackpad. This would suddenly make it possible to advertise iPad Pro as a single computer that can adapt from a tablet to a laptop to a desktop.
iPad Pro as a desktop/notebook has lots of perks, too. Face ID support (no Mac has advanced beyond Touch ID to date), Center Stage support, 120Hz refresh rate with ProMotion display, and countless other features that make the iPad Pro competitive to the MacBook Air, 13-inch MacBook Pro, Mac mini, and 24-inch iMac.