I find equally valid (and perhaps more useful) to say that the notion of truth is the basis of all that exists, and this debate is far from simple. If we don't allow anything to be true at all, then even this discussion, any discussion, or anything at all seems rather pointless. If we're just exchanging gobbledygook, what's the point of even talking? I think there's a general presumption in talking that we're
approaching something. That something is essentially truth (i.e. some accurate and/or useful model of some part of reality) or some kind of
improvement or even
enjoyment, which are both connected to ethics.
Sure, truth is in some senses unknowable (in particular in the 'The Map is not the Territory' sense), but we can have increasingly accurate and useful enough models that improve our lives. It's also the case that most human matters need specific answers, potentially extremely specific to their situation (and hard or impossible to know things, like what's going on in their minds), as well as some ethical and aesthetic frameworks that allows one thing to be good while other thing is bad. It's not obvious at first that ethics could be based on truth and science (and hence have somewhat-universal rights and wrongs), but I've come to believe that's the case indeed. Ethics really derives from fundamental truths about existence, like the reality and nature of suffering (and the nature of the workings of our minds), the nature of existence (for example, work is ethical insofar as it supports us existing at all), and so on.
If you think about it, the notion that anything goes, is really absurd: surely there are things you wouldn't accept essentially no matter what. It's much more absurd than the counterpart that there are true things, even about the nature of existence, that we can approach. The human mind (and minds in general!) can be studied using similar methods to the study of nature (with some necessary generalizations), and I believe that's what the 21st century is going to be all about :)
Edit: That's not to say 'vibes' are not important as well! From Goethe[1]:
"Art is long, life short, judgment difficult, opportunity transient. To act is easy, to think is hard; to act according to our thought is troublesome. Every beginning is cheerful: the threshold is the place of expectation. The boy stands astonished, his impressions guide him: he learns sportfully, seriousness comes on him by surprise. Imitation is born with us: what should be imitated is not easy to discover. The excellent is rarely found, more rarely valued. The height charms us, the steps to it do not: with the summit in our eye, we love to walk along the plain. It is but a part of art that can be taught: the artist needs it all. Who knows it half, speaks much, and is always wrong: who knows it wholly, inclines to act, and speaks seldom or late. The former have no secrets and no force : the instruction they can give is like baked bread, savory and satisfying for a single day; but flour cannot be sown, and seed-corn ought not to be ground. Words are good, but they are not the best. The best is not to be explained by words. The spirit in which we act is the highest matter. Action can be understood and again represented by the spirit alone. No one knows what he is doing while he acts aright, but of what is wrong we are always conscious. Whoever works with symbols only is a pedant, a hypocrite, or a bungler. There are many such, and they like to be together. Their babbling detains the scholar: their obstinate mediocrity vexes even the best. The instruction which the true artist gives us opens the mind; for, where words fail him, deeds speak. The true scholar learns from the known to unfold the unknown, and approaches more and more to being a master."
[1] Wilhelm Meister's Wanderjahre (Wilhelm Meister's Apprenticeship) Book VII Chapter IX