Except that in the case of science and philosophy, change in what is true does not just happen. Truths aren't just a matter of what someone wants to be true or what is "revealed through our searching for it". There are rules and methods. For science, it is the scientific method (make observations, form a hypothesis, make predictions based on hypothesis, experiment to test, rinse and repeat). For philosophy, it's the rules of logic. Even in history, while things are often fuzzier, you are still supposed to be supporting your hypotheses with evidence from archaeology, written history, etc. Your statement was:
And that simply is not how it works in most fields. Maybe in religion, that can be the case (even UUs acknowledge personal experience of awe and wonder as one of our sources) but in most fields, there are definitions to what is accepted as "truth". It isn't just "revealed through our searching for it". Science is the paramount case. There is a lot that is passed off as "science" that is not accepted by the majority of scientists because it has not met that definition.