I use odd words. I wish there were an accumulating score where, if I type something, then undo the autocorrect, then NOT correct my typing, that the iPhone would just let me use my odd words.

Also: I've never ended an SMS with \nb\n...quit adding a B to my texts!

There has to be a massive population of usability folks (or maybe not, Apple seems to be big, but the number of times they sweep engineering attention from topic to topic makes me think the ones that DO the stuff are much smaller.) I'd LOVE to be able give feedback to Apple in a way that wasn't just 'throw a suggestion down a hole, we won't reply to you.'

I suspect there are some emergent behaviors that aren't immediately obvious as they continue to 'improve' the keyboard (for the first XX years I had an iPhone, it never added a 'B' to texts) and I suspect there was a push to go from a really stable, really well behaving keyboard to one that used the neural engine, because over the past two three years, the keyboard started to make language based suggestions/corrections rather than letter based suggestions. It's better, but it's still nowhere near as good as it was three or so major iOS versions ago.