After watching this show many times, I have asked myself what purpose should a Betazoid psychiatrist have on a starship. In regards to Deanna, I believe that a psychiatrist had no business on the bridge of a starship. She was not qualified to be in a position to outrank officers like Data in a crisis situation. It felt rather Soviet-like with a political officer sensing the Captain's thoughts to make sure they were 'correct'. Another issue with Deanna was her willful use of impathy to read others thoughts. That can be considered a violation/ mind rape. She herself hated it when she was at the receiving end of a mind read. The good thing about B5 was that it brought up a different perspective on telepaths. It went into how telepaths had to restrict their telepathy to avoid absorbing the thoughts of others. They were also shunned because non-tels were afraid of getting read. In TNG, those issues seldom ever came up. I will admit that Voyager did visit that topic in its later seasons.
I remember the episode when the Ferengi were negotiating the rights to a wormhole and a Human/Betazed negotiator was using his skills to beat the competition. When his skills were discovered, Picard blasted him for using his telepathy for his advantage. The negotiator made Picard eat his words by pointing out Picard's own hypocrisy of using Deanna for his own gain by reading the minds of others. Cobra