@sometime sun,
Sure, the practical man will laugh if you say that beauty is truth, as our self-deceit is often getting us killed. I grant the practical man his object.
But what about mathematics? There is a debate about the foundation of mathematics. Is it grounded on intuition? Or is it only a system of rules that must be followed exactly? Is it finite, or does it allow of the infinite? I think to say that something is intuitive is not far from saying that it is beautiful, at least in the case of math.
Let us also consider this phrase "beauty is truth." Is
this statement itself a beautiful truth? Is e=mc^2 a beautiful truth? Is science influenced by our sense of the beautiful? Are we not more likely to discover the patterns that please us? F = ma. That's a beautiful simple equation. We want the simple and the true. Are scientist driven by the desire for practical power? Some of them are, I bet. But others are probably just seeking form. An interesting issue. I don't think it's dead.