The brainwave decoder is quite awesome but for the brain in question to command, the training to repeat a single task / word / function by thought in order to command or dictate for the interface to decode is quite a steep curve or was in the early stages of the development.
Discussion
It can read your brainwaves, but not really your thoughts as little as a dog would follow a strangers body language to do wonder tricks.
So intrusive would be a desired feature rather than a need for fear.
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Linguistic thought patterns are very personal and thus a one size fits nobody is a challenging requirement without individual training and practice.
#abc
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