Because that goes against Apple's user experience grain. Auto-Correct was also a critical feature to gain popular approval of then-untrusted on-screen keyboard

Because that goes against Apple's user experience grain. Auto-Correct was also a critical feature to gain popular approval of then-untrusted on-screen keyboards when the original iPhone was released. Maybe by today's standards, Apple's Auto-Correct lags, but back then it was a shifting force. Now, phones with physical keyboards are nearly (and sadly) extinct.