expect that people will agree on many values, e.g. whether art, psychotherapy, the worship of some particular concept of God, maximizing lifespan, hedonism, making money etc. are how best to live one's life.

But one of these isn't just a value question but a factual question about the real world. For example even if one is a utilitarian, if there's a classical vengeful deity, then knowing so is important. It isn't a good idea to confuse questions of values with questions about the nature of the universe.