I wish I had a "crystal ball" that would tell me which features of a device I'll need forever into the future. I don't though, so I have to rely on the mfg's spec's and verify that incoming materials meet them. If they don't, they're broken and should go back for replacement, irrespective of my current functional requirements.

Manufacturers that put more than, say, 0.001% "broken" parts out onto the market should immediately be forced out of business. If their design, testing, manufacturing, and quality control, taken together, can't ensure fewer than ten failures per million devices, they're producing junk. That's why I don't buy cars made by FORD, GM, or Chrysler.

If you use a part that works only under the circumstances under which you require it to function, aren't you concerned that the "broken" features are an indication that the device itself is defective?

RE