Downgrading to iOS 17 is just not attainable as it isn’t but launched. As soon as iOS 17 is launched, you might be able to downgrade to it from a more recent model of iOS, however it isn’t assured.
Downgrading to an older model of iOS could be helpful if you’re experiencing issues with the newer model, or for those who desire the options of the older model. Nevertheless, you will need to be aware that downgrading may also trigger issues, so you will need to weigh the dangers and advantages earlier than continuing.