Downgrading to iOS 17 is just not doable as it’s not but launched. As soon as iOS 17 is launched, you might be able to downgrade to it from a more moderen model of iOS, however it’s not assured.
Downgrading to an older model of iOS may be helpful if you’re experiencing issues with the newer model, or in case you want the options of the older model. Nonetheless, it is very important word that downgrading may trigger issues, so it is very important weigh the dangers and advantages earlier than continuing.