It's an interesting topic for sure, and who knows what the answer is? I remember reading an article recently about how the majority of people with psychic abilities also have experiences with mental illnesses such as depression (not to be confused with the majority of people with depression are psychic), so I suppose there's a correlation there between a person's emotional depth, depression, and psychic abilities?
I've been told I have extremely raw talent and the potential for powerful psychic abilities once I get my mediumship training down, and I'm bipolar, so I guess I speak from experience?
I do think that empathy is an important point here - not that all psychics are empaths, but psychics who ARE empaths have that added bonus I guess, and in order to be an empath you are incredibly sensitive. BUT on the flip side, I've noticed that people who are more withdrawn into their own feelings are more analytical, and to be honest that's not a bad attribute to have if you're practising say, psychic readings.
So I guess it all comes down to personal opinion; every psychic is different, they work in different ways. I, personally, use my empathy as much as I use my psychic abilities in a reading and my sensitivity is what helps me... but to others, they could find it useful to be cut off from making that emotional connection to a sitter, and provide them with only the cold, hard facts, which arguably may make a better reading? So if you're asking if being more sensitive makes you a more powerful psychic - no, in my opinion, I don't think it does.