This is a LONG standing Intel problem. From their partnership with PowerVR on Atom processors about half a decade ago where the released a grand total of ONE bug fixes driver after the OG one, to their abandonment of the GPU in KadyLake G, to their most recent abandonment of one of their HPC versins of Xe. Intel doesn't have the stomach to put effort into continual driver development on ANYTHING that isn't critical to their cash cow CPUs, which means chipset drivers (which change very little) and the security processor platform critical for their business customers. Making Xe drivers better doesn't make them IMMEDIATE cash.
Frankly, I was borderline flabbergasted when they announced XeSS being platform agnostic. DLSS is likely the only reason for them to consider it, but I doubt seriously that it ever goes anywhere when they likely believe they can just compute their way past NVidia without it.