I have been specializing in the repair and restoration of vintage plumbing fixtures for nearly twenty years now. I long since came to the conclusion that being old does not make something good or worth restoring. Yes, there is a correlation, and yes, things do not seem to be manufactured today with the same high levels of care and integrity that seemed to exist long ago.
Think about this though. Of the product that has lasted and endured for the last sixty, seventy, and eighty years, how much is that longevity associated with good design? By good design I refer not only to solid enduring function, but to timeless visual appeal. Yes they last but do they last longer because we like the look of them and continue to keep them in working order? What of the product that was not attractive? What of the product that was not designed well enough to last, be appealing, or be easily serviceable? If it wasn't well designed all those decades ago how much of it do we still see today? I have to wonder how much our estimation of the value of older product is skewed by the quality of the remnant while we do not see the quality of the whole.
My point is this. When quality materials and good design come together enduring product tends to be produced. When economical materials and design by necessity come into play the resultant product will not tend to endure. I typically express this notion by simply saying, 'Quality in-Quality out.' I have not, until now, put my thoughts about it into written words. So there you have it.