Skepticism

For instance, there are many things about black holes that we will NEVER know, because it is beyond possibility (according to this "reality", anyway) to know them.

Such as?

Would you say that we shouldn't worry about these things, then, since science can't prove them?

Of course not. Just because we do not know them does not mean that their presence does not affect our universe. In contrast, whether or not this is a dream really does not affect us as far as this reality is concerned.

Why are we even arguing over what's important? Seriously? What's important to you might not be important to me.

I'm not arguing about what's important. Importance is subjective. I'm arguing about what is relevant; what lines of inquiry produce applicable results, and what lines of inquiry are merely superfluous. I'm also attempting to establish a set of axioms based on which rational discourse can then proceed.

I could make a case that almost every bit of scientific research, at least outside of the medical field, is pointless and wasteful.

That is your opinion and you are entitled to it. I think, however, reading a bit on the history of science would change your opinion about this. Even if you don't think knowledge about our universe is important aside from it's applications to humanity, you would be surprised learn how some "pure" science has very tangible effects on humans.

In the end, in my opinion, it simply comes down to minding your own business and letting people do or think whatever they want.