This one is tough. A longer warranty is a way to reassure customers that it’s made better, with the promise that it will be repaired/replaced if it breaks. And if they honor their warranties as promised, it’s probably valid. Warranty claims are expensive, regardless of industry, so they go to great lengths to minimize claims. Whatever the warranty is, you can reasonably be sure that it will last that long, but probably not a second longer. Again, assuming a trustworthy company that will honor the warranty.

Otherwise, anyone can shit in a box and mark it guaranteed. If it’s from Amazon/AliExpress, the company probably won’t even exist in 6 months (but a strangely similar new company will).

The flip side is that an unusually short/weak warranty, below that of its competitors, is almost certainly a shit product. They aren’t even going to pretend it’s up to industry standards.