Price/performance. A warranty is great but it is one of those things that is a catch 22. Awesome to have that you paid for, but you really shouldn't need to use if the QC is there so it is an extra expense.
The 10980XE isn't reliably in stock, numbers were bouncing as high as $2999, and it is basically the same proc as the 9980XE. For the 10th Gen's there still aren't any that play dual role as noted. You can go lower down the stack but if you do anything professional then they are a worse choice...
That would be why just about every page indicated gaming and productivity. What would a high-end system look like that you could do both with reasonably well? Hence the use of a Threadripper on the AMD side of things.