There is a very good reason to announce it with fanfare: completely depleted batteries can get permanently damaged.
It also allows the user to plan better around the downtime. I'm actually able to continue with zero downtime on me in-ears because I detach one of them and power it up while the other one gets depleted further.
With my over-ears I'm unable to do that but they last many hours more. Which is logical as they're more bulky, have a larger battery, and don't have a case containing a battery.
> Speaking of awful bluetooth behavior that has no conceivable reason to exist, I lose all my normal computer audio whenever I'm using voice chat. Why? Well, voice chat takes input from my microphone, which switches the bluetooth device into "headset" mode. Headset mode converts stereo audio to mono and it is the only audio output you're allowed to use while you're providing audio input, or might potentially provide audio input.
True, this is silly, this also happens when you phone. But I actually don't want high quality sound when someone speaks. I've had people's background noise during gaming; not my preference. The irony is that with ANC, there's mics active all the time as noise cancelling depends on that.