Reminds me of some research I once did in order to reduce typos on low-end Firefox OS devices. The capacitive touchscreen had horrible limitations, especially for typing. It had bands across the screen where it could only detect one finger at a time. Once you picked up typing speed it ended up in similar misses you see in the YouTube video, albeit even worse (you end up with a letter between your two fingers).

Eventually found two simple but effective ways to improve autocorrect/typing performance. First build a personalized and adaptive touch model trained on the device itself, mainly to fix simple typos. Second to fix low end screen limitations, use simple heuristics based on touchstart, touchmove and touchend [1].

Anyways, I'm no iPhone user but interesting to read. It would drive me nuts.

[0]: https://www.brianweet.com/2015/03/24/implement-touch-model.h... [1]: https://www.brianweet.com/2015/04/08/low-end-touchscreen-lim...