You're right !!! Actually, I didn't find the setting where to set the default audio out and mic in, but for me it automatically switched to the bluetooth headset !

You actually can do this in settings, there is an option to connect a device through Bluetooth and you can change the default speaker and microphone to another device.

I agree a headset, maybe even through USB c would be great !
Also, turning off screen saver doesn't work during calls (auduo, only of course)... Which would be nice for late calls !

Thanks for these suggestions. Regarding your desire for a way to shut off the screensaver, the voice command "Hey Portal - Go to sleep" should accomplish this. Please give that a shot and let us know if that works for your needs!