Not for everything. That is all. In pratice science is a powerfull, yet limited method.
Yes. It is limited to matters of fact. It cannot deal with those things that are mostly opinions. For example, aesthetics are an important part of life, but science itself can say nothing about whether something is beautiful or not. It *can* determine the chance that a person will consider it to be beautiful. But those are very different questions.
The same is true for morality. Science cannot determine whether an action is moral or not. it *can* say what the likely consequences of various actions would be. It can say what percentage of people would consider that action to be moral and, perhaps, what personality characteristics lead to different judgements. But morality as such isn't within the domain of science.
There are many other aspects of our existence that science cannot address. But the *reason* it cannot address those things is that there is no way to *test* them. There is no way to determine which of two opposing viewpoints is, at least, wrong. And that is *precisely* what separates subjective opinions from objective facts.
As long as you understand that differently, then that is that.
In effect it seems that you don't understand when you use feelings, norms, usefulness and other personal evaluations of what matters.
That is partly because there are a few different meanings to those concepts. Science, more specifically logic, *can* say what sorts of evidence would be relevant to saying a particular theory or hypothesis is wrong. It *can* say what sorts of things need to be considered to determine the possible consequences of actions. It *can* say what risks are associated with various actions.
But what science *cannot* deal with is matters of 'should': if you simply are not interested in the facts, then science will be irrelevant to you. If you don't care what the consequences of your actions are, then science cannot help you. If you want to know what you *should* do, then science cannot help past showing you what the likely outcomes will be.
But, for most people, those consequences *are* relevant and useful to know about.
In short I have never seen evidence using science for the word that sceince is the best method we have. That you do that different and apply your thinking and feelings to best and then claim that is in effect objective is your problem, not mine.
I would *love* to see a better method! What method do you propose that guards against known failures of how people think and judge? How do you deal with confirmation bias? How do you deal with it when people have different opinions on some matter?
The only way we know about, currently, is to *test* the ideas we get and limit ourselves to those ideas that can be tested. And, ultimately, that testability is used to *define* what it means to be 'true' or 'false'. It is ultimately used to *define* what the word 'reality' (as opposed to fantasy or opinion) means.