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Still need to make it run on PS4, XBox and every Android version lower than 10 (Vulkan was an optional API until 10).

These two consoles may be pretty close to EOL. If the next consoles have vulkan it would absolutely make sense to use vulkan more.

Hint they won't, even on Switch it hardly gets used, Unity, Unreal and NVN based engines get the biggest piece of the pie.