The problem they have is that android doesn’t support this method of authentication so it can’t be used as a way to pay for things via NFC etc.
Once android supports faceid authentication we will see an explosion in devices with faceid.
Android Q supports it, but we’re not seeing any devices with Face ID. This is apart from the Huawei and Xiaomi devices previously mentioned. Android clearly has access to the hardware.
Android is going in the direction of fingerprint sensor. It’s clear why. They can make a true zero bezel device far more easier with fingerprint.