They are optimised for both, its simply that nVidia are lacking some A-Sync features.
nVidia have had 6 months to get all they can out of Doom Vulkan, it is what it is....
Your Right it is what it is, but what is it? Imo it is pointless for Nvidia to optimise for vulkan when opengl performs similar on Nvidia cards.
Amd of course is well worth optimising vulkan, vulkan needs to be careful it does not fall into the realms of an amd only api or else it will be dead in the water only catering for 30% of gamers.