Will iOS 17 be compatible with iPhone 8?

No.

To read about iOS 17, go to this web site: iOS 17 Preview - Apple

Model requirements: iPhone XS, XR and later

Apple is not here, just fellow users, and the product teams won't see your post here either. Apple's iOS 17 will support this list of iPhones. There is a reason the iPhone 8 is not on that list of supported phones and Apple will not be adding a hardware outdated device to the supported phones.

reply: DanielScz … iOS 17 for iPhone

Before you decide whether you should upgrade to iOS 17, you need to know whether you can upgrade to iOS 17. The main headline devices that don’t make the cut this year is the iPhone 8, 8 Plus and iPhone X. The following iPhones get support for iOS 17, but some features are only for iOS 12 and later, including some FaceTime and autocorrect features.

Will iOS 17 be compatible with iPhone 8?

No

If not please add

Tell Apple. Feedback - iPhone - Apple. But, I don't think they will listen.