You don’t have to “know” the “fundamental truths” to the universe to see comparatively clearer and deeper, and to have a set of beliefs and worldview that allow you to handle life better than others (you can’t, actually, remember why Socrates was so wise!).

Friends and relationships in general are something else and, at least IMO, the most important and fulfilling part of life. People do act as mirrors and will also provide you with different POVs which could help you make better decisions, and their support and care will allow you to more easily get through hardship, but these POVs are not necessarily more realistic and productive than yours. Basically, people around you could love you to the best of their abilities and still be too confused and ignorant to help you mentally deal with life (and a competent therapist comes in handy in this situation).

Also, the counselor should care about your wellbeing the same way a medical doctor would, because of basic human empathy (and perhaps little bit of pride and work ethic), and not the way your mom or bff would. And that’s enough, anything more would probably feel fake and also be very draining for the mental health professional.