For most people, the iPad Air 4 is so much iPad Pro — it's even got the faster A14 Bionic chip versus the A12Z Bionic — that it's just a better value. Instead of getting an 11-inch iPad Pro for $799, you get more bang for your buck with a $599 iPad Air 4 and an Apple Pencil ($129) or Magic Keyboard ($299). Its pricing also puts the squeeze on premium Android tablets that used to undercut the iPad Pro.
The iPad Air 4's virtually identical dimensions to the 11-inch iPad Pro means it works perfectly with the 11-inch Magic Keyboard. This is hands down the best keyboard accessory for the iPad Air 4. It's pricey at $299, but worth every penny if you type a lot.
The best thing about the iPad Air 4 is that it's not a downgrade from the iPad Pro where it matters: performance. iPad OS 14 runs just as fast (if not smoother because of the A14 Bionic) and battery life is still tops (up to 10 hours). Android tablets (whatever's left of them) don't even compete. And I'm certain it'll remain this way for many updates to come. (If the iPad Air 2, released in 2014, has been updated for six years, I'm confident the iPad Air 4 can last just as long.)