Excellent point Noumenaut, we don’t have a time machine. What can be known is what we know right now. There are industrial tests that can be run, typically done component by component, to get more accurate test for long term reliabilty, with that data made available to manufacturers, which they use to pick quality. Having done some buying and part specifying, i can say there is not a one to one correspondence of price to quality. So i try to avoid that, but it is good to wonder. But cheaper doesn’t necessarily always mean lower quality.
Over in the Hydrasynth thread i posted about the failure bathtub curve. It is useful to understand that relative a products reluability, both short term and long.