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Not on mobile Android powered ones.

It should be, it is part of 1.2. (https://vulkan.gpuinfo.org/listfeaturescore12.php the first entry bufferDeviceAddress, supported by 97.89%)

Or did you mean some specific feature? I haven't used it on mobile.

Supported as it actually works, or gets listed as something the driver knows about, but full of issues when it gets used?

There is a reason why there are some Vulkanised 2025 about improving the state of Vulkan affairs on Android.