According to AppleInsider , this means users of iPhone 8 and X models will not be updated to iOS 17 when it releases this fall.

The iPhone Xs was released by Apple in 2018, which means that any iPhone released by Apple in the last 5 years will be updated to the new iOS. In reality, support may vary as some features are expected to require newer models.

That's what Apple has been doing for years to entice people to upgrade to newer models if they want to take advantage of all the features of iOS 17. Apple Support has also shared information saying, "The features and apps you get may vary depending on your iPhone model, region, language, and carrier."

Although iOS 17 won't be available to download and install until next fall, Apple will also release developer and beta versions for those willing to take the risk of installing it on their devices before then.