Can these implants even do anything more or do it better than a simple external EEG cap? I haven't seen them showing any benefit of it being implanted directly in your brain over simply using external devices that have existed commercially since the 80's/90's.
We (as in humanity) can continue to develop both EEG caps and direct implants. The technology is young and there's no telling what side benefits and additional functionality either one can have.
And the implant, much like early EEG devices, barely works for now. Imagine what they'll be capable of 10-20 years down the line.