iPhone SE 2020 and iPhone SE 2022 will be the only remaining models with home button still supported...
iOS 17 and iPadOS 17 may require A12 Bionic and newer
I have checked the base iPad models and there is no A11 Bionic version... iPad Air 3 uses A12 Bionic so it is possible that it will be the minimum supported chipset... Also, iPhone 8/8 Plus/X are all on limited support on iOS 16 and they may get dropped once iOS 17 is announced/released...