Nope, you are not alone. I noticed this change starting with iOS 7 too and compared side-by-side back in those years. I could type very quickly with either one

Nope, you are not alone. I noticed this change starting with iOS 7 too and compared side-by-side back in those years. I could type very quickly with either one or both hands, and made almost no mistakes. So yeah, it seemed that they changed the position or the targets of the 'keys' because I wasn't hitting the right ones in iOS 7, usually shifted by one letter to the side but my mind sort of calibrated for the rest of the word. Then I switched between different iPhone sizes over the years, so all my experiences later were different. This still keeps happening to me but now the autocorrect on the phone gets the word I was intended to type, so it's less annoying but long gone are those days of keyboard perfection.