>”hardly any Windows games running on top of Vulkan”

I run all my windows games on Vulkan.

https://www.pcgamingwiki.com/wiki/List_of_Vulkan_games

280 games over 10 years really isn't impressive, and D3D12 (890 games) isn't great either when compared to D3D11 (4.6k) or D3D9 (3.3k), it really demonstrates what a massive failure the modern 3D APIs are :/

I don't think those lists are complete, but they seem to show the right relative amount of 3D API usage across games.