In 2020, a self-typing keyboard is easier to make than a regular keyboard
I didn't write that tweet, GPT-3 did, via a custom keyboard prototype I built for iOS. It looks like a regular keyboard, but it can type for you. You can give it a few keywords, and it types out a perfect email. You can translate formal business English to casual English, and back again. The suggestions are great, and the keyboard is just a simple button for each character, pretty simple.
Or not. Fitting a qwerty keyboard onto a tiny screen requires a lot of work. Human fingers are big, so below the hood, iOS tries to guess which word you're typing. Weirdly, that guesswork mechanism is not available for third party developers. They have to create from the ground up what took Apple a decade to perfect. And that's where I flipped the table and left a promising prototype.