Because everyone is busy targeting DirectX 11/12, NVN, Metal and LibGNMX.
Vulkan is mostly Android 10+ thing in games development, even on the Switch, there are other APIs to choose from, with Unity having a big piece of the pie, 50% of the titles according to the company numbers on 2020 Unite keynote.
Vulkan is mostly Android 10+ thing in games development, even on the Switch, there are other APIs to choose from, with Unity having a big piece of the pie, 50% of the titles according to the company numbers on 2020 Unite keynote.