Are you claiming that people aren't using FP32 on mobile, or are you claiming that people are using FP32 on mobile but could technically have gotten away with FP16?
If it's the latter, it's still correct to say that FP32 is king in mobile graphics.
Unless people explicitly ask for high or at least medium precision in the code, they probably will get FP16 floats on a mobile chip, which is totally fine for most fragment shader calculations.
