Hm.. does not seem so optimal, even without bluetooth.

Like, aside from bluetooth, I got two audio devices - my Monitor and my Laptop (which runs the game). If I got my laptop speakers active, I usually have wired headphones plugged into the laptop, and simply unplugging them switches freely between laptop speakers and headphones. But - if I change the audio device from laptop to Monitor or vice-versa, the game doesn't adjust to the change and keeps giving the audio through the formerly active audio device.

Fazit: Still have to restart the game with most audio device changes, still not really optimal solution on the game developer's side.
Can't really call it 'fixed' when it only works in some specific cases.