iOS repeated “learns” new words that I use that are misspellings of real words (because I mistype things in a predictable way). It becomes so convinced that it will autocorrect the real word into the typo. And knowing how the keyboard works, I wouldn’t be surprised if it enlarges the touch targets for the typo once it thinks I meant to use the typo.

The cause is obvious: Apple is training on what I type, not what I send. Apple does not consider that I actually care about the accuracy of what I send and will fix errors; perhaps they optimize for people who are careless enough to send typoed messages, yet niche enough to commonly use words not in the default dictionary.

It is infuriating that I have ~50 manual corrections telling Apple to leave words alone and correct certain typos to the real words.