Once the scope is out, a lot is learned from simply analyzing service department records. That's usually where we find the most statistically significant data on how different designs hold up under average use.
That's the strategy where the customer who bought the product also serves as the durability test function.
I'll take a guess that companies who use that strategy as a principle measure of quality/durability speak the loudest about their exceptional warranty/customer service policy in media ads.
Some companies DO have either in house or use test labs to validate their product. My comment above is not specifically aimed at optics companies.
