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Exactly, Virgil. You're definitely right about the length of time involved. Good stuff can take a long, long time for failure modes to appear, and it's really instructive in the meantime.
Testing is something of a necessity, if one truly wishes to know the nature of materials As with so many other things, a wide range of quality often exists, but our tendency is to accept simply identifying materials as species and leaving it at that. That's as naive as identifying a liquid as "wine", ignoring the gulf that separates stuff some homeless guy under a bridge is guzzling from the fine vintages offered in a four-star restaurant.
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