What opportunities do consumer gadgets of the brain-computer neural interface provide?

Question

Machine learning

More than 10 years have passed since the appearance of Emotiv Epoc and after Insight (I deliberately do not consider models with 1-2 sensors and the ability to assess the level of concentration as much as possible - this is not interesting), and something I do not observe a total development in this direction or I just live in a hole? Two and a half devices and that's it? And those roll down to a maximum of a limited list of possibilities - emotions and concentration.
The sensors themselves are expensive but, as always with hardware, they do not make sense without adequate software. I'm talking about open source implementations. I can not estimate how much everything is developed there now.
Excellent article https://geektimes.ru/post/115055/, unfortunately Google does not give out other articles on the Russian-speaking Internet of a level more than marketing. I am interested in the impressions of not only the user but also the developer. And in the English-speaking part of the Internet, I am drowning in information flows, and even more marketing nonsense.
In particular, how far has software progressed in learning and pattern recognition? How good is it, and is there any possibility at all, to train the software to recognize my thoughts and mental images, and not attempts by the user himself to learn to think exactly as the device is trained ?
If I expand the Tetris learning example, when at first the program uses keystrokes as target signals, and later this keystroke is no longer required, is it possible to learn based on my situations, i.e. raw data is recorded and in parallel all user behavior, later, the user marks the collected data, determining the meaning of his actions and highlighting the necessary ones among them, and on the basis of the recorded EEG and these marks, training takes place - is it possible to implement this, on which devices and what quality is obtained recognition?
On what, if possible, Russian-language forums / blogs / social networks / BBC can I ask such a question and maybe even get an adequate answer?