hen there is Councilor Troi! What they take their high school guidance councilor into space!
LOL!
Clearly you never watched the show.
Troi is not human. She is an alien empath. An empath is capable of reading emotions in humans and other aliens, although not actual thoughts. Her purpose on the ship was not just to be a psychologist for crew members but to ascertain the motives of new aliens they might encounter. The universal translator might convert speech, but she was there to identify when the words didn’t ring true compared to the emotions of he aliens speaking.