I have never had any issues using bluetooth headphones while my Android watch is connected. Not once.
I also haven't had issues with interaction with "wifi-rich" environments, and I live in a 26 story building with dozens of WIFI networks.
The battery life issue is entirely dependent on what model of headset you have. I did the research, and got a set that lasts a good long while.
I'm not saying that I agree with the removal of the jack, but your arguments don't apply to any environment I've encountered in recent years.
6 years or so, Bluetooth was far more dodgy, and didn't provide sufficient quality for music anyway.