quantics

There's not Desktop version for this though, right?

Good thing they listened. There was simply no excuse for this 'feature'.

Another option is to disable transparency under System Preferences -> Accessibility -> Display.

Check "Reduce Transparency" to make your menu bar (and dock) opaque.

I happen to like it better that way.

From what I can tell, it will be locally hosted, and non-cloud dependent. Don't know about the open source though (we can guess not).

Regarding the second part of your comment, an EEG device like that will have access to way less information (even with state-of-the-art signal processing techniques) than, say, an Apple watch or a FitBit, which have access to tons of biometric information (pulse, ECG, sleep data, constant geolocalization, living habits + much more if you also upload your weight and blood pressure measurements in the companion app), yet the vast majority of the public didn't seem to be too preoccupied when those came out.

I disagree. Even if you could record only a couple of bits (essentially being able to click with your mind), wouldn't this be useful already?