I was able to thumb type at high speed and accuracy on the 3.5 inch iPhones. On modern iPhones, I produce more typos than ever, because apparently Apple thinks it knows which key I meant to hit better than I do, even with all the autocorrect and suggestions turned off.

I've banned social and don't use my phone much anymore, so it's less of an issue than it used to be, but it's really frustrating when I'm clearly hitting the right key and it insists on pretending I hit an adjacent key.