Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes, except for Mac. The readings are obtained directly from the platform on Android when possible, and implemented as a fusion sensor on top of the Accelerometer implementation otherwise (and in other OSes except for macOS). There is support for gravity sensors in the Linux kernel as well, but we need to write some extra logic to handle falling back to a fusion sensor if they are not present".
Per this discussion, only older Mac laptops seem to ship with accelerometers. We currently only ship the Accelerometer interface on Macs, but not LinearAccelerometer, in order to support the older Device Orientation/Motion APIs. As such, there does not seem to make much sense to ship this API on Macs either.
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What is the accuracy of the sensor readings here? I am seeing rounding for other types of accelerometers, but not this one: