Greetings monroerr,
Thank you for using Apple Support Communities, it's great to have you here.
There were some changes made to iOS 17, which Apple described thus:
Autocorrect receives a comprehensive update with a transformer language model, a state-of-the-art on-device machine learning language model for word prediction — improving the experience and accuracy for users every time they type. It also receives a refreshed design to better support typing, and sentence-level autocorrections can fix more types of grammatical mistakes. Users will now receive predictive text recommendations inline as they type, so adding entire words or completing sentences is as easy as tapping the space bar, making text entry faster than ever. Dictation leverages a new speech recognition model to make it even more accurate.
This info can be found here: iOS 17 makes iPhone more personal and intuitive - Apple
If you'd like to leave feedback for Apple, you can do so by heading here: Product Feedback - Apple
We hope that this information helps.
Many thanks!