Guess why?
For example it is silly when Microsoft still uses "Microsoft Basic Display Adapter" with WDDM 1.3 version in their latest Windows 11 (23H2) package, but tells others to purchase new hardware (GPU, notebooks) with support of WDDM 2.0 model and above.
and with the help of Microsoft, hardware vendors (GPU) do not want to meet WDDM 2.0 requirements for legacy hardware by updating their drivers, which is actually possible, but not profitable - and all this is called marketing.