I don't really fault Intel for this more than say Bethesda. Both AMD and NVidia still supply a number of game-specific fixes for crashes, glitches, performance improvements in their drivers for new and old games. They've been doing this for decades now and still has to release driver updates to fix game specific issues.
The fact that the API is a "standard" doesn't mean everything is clear-cut. Developers often use these APIs in unexpected ways which were never accounted for or even mentioned in the documentation.