MacRumors published an overview of all features that Intel based Macs will not support.

macOS Monterey: Here Are All the Features Your Intel Mac Won't Support

Apple's official public release of macOS Monterey arrives on Monday, October 25, and users should be aware that there are several features in macOS 12 that are only available to machines powered by Apple silicon chips. In other words, they won't work on Intel-powered Macs. Differentiating the user experience like this isn't anything new to iOS users, since each year the latest iPhone models boast features that aren't available on iPhones that Apple released the previous year. Mac users on the other hand aren't so used to such fast-paced changes, and the latest software-based depreciations could come as a shock to some. 

macOS Monterey: Here Are All the Features Your Intel Mac Won't Support