https://www.guru3d.com/news-story/amds-chiplet-design-allows-them-to-reduce-cost-of-the-ryzen-9-3950x-by-half.html
 
At its 2020 IEEE ISSCC keynote, AMD presented two slides that detail the extent of cost savings yielded by its bold decision to embrace the MCM (multi-chip module) approach to not just its enterprise and HEDT processors, but also its mainstream desktop ones. By confining only those components that tangibly benefit from cutting-edge silicon fabrication processes, namely the CPU cores, while letting other components sit on relatively inexpensive 12 nm, AMD is able to maximize its 7 nm foundry allocation, by making it produce small 8-core CCDs (CPU complex dies), which add up to AMD's target core-counts. With this approach, AMD is able to cram up to 16 cores onto its AM4 desktop socket using two chiplets, and up to 64 cores using eight chiplets on its SP3r3 and sTRX4 sockets.

AMD compares the cost of its current 7 nm + 12 nm MCM approach to a hypothetical monolithic die it would have had to build on 7 nm (including the I/O components). The slides suggest that the cost of a single-chiplet "Matisse" MCM (eg: Ryzen 7 3700X) is about 40% less than that of the double-chiplet "Matisse" (eg: Ryzen 9 3950X). Had AMD opted to build a monolithic 7 nm die that had 8 cores and all the I/O components of the I/O die, such a die would cost roughly 50% more than the current 1x CCD + IOD solution. On the other hand, a monolithic 7 nm die with 16 cores and I/O components would cost 125% more. AMD hence enjoys a massive headroom for cost-cutting. Prices of the flagship 3950X can be close to halved (from its current $749 MSRP), and AMD can turn up the heat on Intel's upcoming Core i9-10900K by significantly lowering price of its 12-core 3900X from its current $499 MSRP. The company will also enjoy more price-cutting headroom for its 6-core Ryzen 5 SKUs than it did with previous-generation Ryzen 5 parts based on monolithic dies.
 
So AMD has not only innovatively progressed in CPU manufacturing, but they have also learned how to save money in doing so. 

Maybe is really reason because customers can't find i9-10980XE because his price is not justified if he is not best processor on market.
Intel will have huge problems to accept real value of Intel processors if this continue.
He will not accept that easy and customers will pay because of that. 
Some people even talk that Intel because power consumption can't dominate in area of Mini PC until they figure out how to catch AMD.
With much smaller power consumption they could produce CPU pre-installed with GPU on motherboard and sell that for gamers who don't want much bigger PC then router as Intel NUC. But for GPU again they need Radeon. They don't have own GPU as AMD to start some bussiness like that.
If AMD continue with better deals then Intel, they will fast catch Intel's value. AMD have and CPU and GPU.
Always could sell own PC and Notebooks in different size without help of Intel or NVIDIA.