I've created new animation for Bluetooth via AnimatedVectorDrawable (it's in a test app): https://www.youtube.com/watch?v=PR2tUNUDpNw As you can see, it's still in beta stage, but I could make it look better. I think it would look better on Lollipop and up, and for older versions we could still use the current (whole FAB spinning) animation. Here's the video of the current animation: https://www.youtube.com/watch?v=GXymEU_BAWY
That’s a nice little big detail!