I can think of a couple reasons: 1. You use Bootcamp, Windows virtualized, or Linux Virtualized 2. You are worried about first gen hardware 3. You believe that

I can think of a couple reasons: 1. You use Bootcamp, Windows virtualized, or Linux Virtualized 2. You are worried about first gen hardware 3. You believe that a high end Intel iMac will be faster than an Apple Silicon iMac. 4. You believe that Intel Macs will be supported for at least 5 years. All four are why I'm buying a new Intel iMac when it comes out, and keeping it for 5 years (as has been my Mac cycle).