I'm just trying to work out the target market for the i9?
Most people who need the cores (eg CAD, etc) will also want ECC RAM (which the i9 lacks support for) hence would be looking at Xeon's and most likely nVidia Quadros or AMD Raedon Pro? Additionally, the X299 chipset only supports 24 PCIe lanes, so without looking at workstation chipsets, any system with the X299 chipset will be gimped in some manner? (most i9s support 44 PCIe lane setups)
Game engines are having troubling scaling past 4 cores, so it's not gaming. Software developers who need the cores/threads would be looking at the most stable platforms (eg Xeons w/ECC RAM)... And as mentioned, CAD users will already be on Xeon's with ECC RAM... And if it's for scientific use, then a lot of users will demand ECC RAM to ensure a single bit flip doesn't taint any data in their research...
Or is the i9 simply a "who has the biggest ... " contest for marketing?