I studied Psychology & Counselling and in a counselling session a Therapist doesn't really give advise nor offer insight into a situation based on what s/he thinks unless mirroring what the client says.
Client: "I am angry because my mother is a control freak!"
Counsellor: " So, your mother makes you angry because you see her as a control freak".
It is all about rapport and a lot of listening and even challenging a little if there are inconsistencies. Walking in the client's shoes you could say.
With "Tarot" I know some use it to "counsel" only if advise is given it makes me wonder. I suppose choices could be laid out and then it is up to the client to choose, but advise is not usually what a counselor does. S/he is supposed to enable a client to see through whatever confusion or dilemma and then to make her or his own choices etc.
Tarot gives advise and choices and it is the responsibility of the reader to be considerate and not harsh if it isn't necessary. As for the sitter, if s/he is not prepared to listen to a few home truths, then s/he should not be asking for a reading.
To me it works both ways.
I worked as a Tarot reader, astrologer, and Bach Flower therapist in close cooperation with a psychiatrist/psychotherapist during most of the 90s, plus I had the opportunity to watch quite a few others as well. Based on that, I would say, it really depends on the therapist whether any advice is being shared or not. A Freudian psychoanalysist is not supposed to be anything but a blank screen for a patient, whereas a behaviourist may emphasize working out practical solutions together with them. In practice, many take a position somewhere in-between.
Tarot can also be used in a way that has the querent simply tell whatever they associate with a certain (possibly even consciously chosen) card. Of course, this is quite different from a classical reading. I found that what works best for me in a therapeutic setting is a middle way between telling the querent how I read the card, and giving them space to develop their own thoughts. In other words, I like to use the cards as a foundation for a dialogue.
And yes, I do say what I see in the cards, even at the risk that the client doesn't come back (but they do, as a rule). Working with psychotherapeutic patients taught me that it doesn't always matter
what is being said as much as
how it is being said though. There is an upside to almost everything, there are opportunities for growth in most situations, and there are very often ways to turn a wsell understood condition to the better. For that matter, I do emphasize advice over prediction - for little is set in stone.
Talking about the advice that Tarot can offer, again, I consider that I wouldn't be doing my job properly if I would twist what I'm seeing in the cards in a way that would make the most sense to my conscious mind. To give you an example:
A member of a therapeutic group, a young woman, wanted to know if she should approach her father whom she didn't have any real communication with for a number of years. The cards gave a clear warning, and I told her so. No, there were some "professional" therapists present, trying to do things by the book; they were truly shocked by my discouraging the young woman from taking that step now, and critisized me rather heavily. Only in the aftermath of my reading, and with the help of aforesaid psychiatrist, did it turn out that there were some heavy issues regarding that relationship that needed to be addressed first in the patient's psyche. The psychiatrist concluded that approaching the father prematurely would only have reinforced those problems - and applauded me for foreseeing this.
So yes, being honest about what the cards tell you is crucial. Even when they don't give you the picture you/your sitter would like to see, it might lead to something really helpful - which would never occur if you would have glossed over the negativity. But how you say something may indeed make all the difference.