A product can last X years without being something you want to warranty for that time - because "last" can mean "keeps working with maintenance and repairs" vs "works without a hitch for the whole time.
Also, longer warranties can be a selling point (speed queen does this with the same exact internals being sold with a higher warranty on the 'fancier' ones which just add some more features to the board).
And, a company has to hold monies on the books for warranty service, so a defined warranty period that is not unreasonable can help with that.
But the "best" company in a given market only needs to warranty beyond the nearest competitor.
Speed Queen also is implicitly dealing with people who would buy the "lifetime" warranty residential unit and run it in a commercial setting, where the wear parts would wear out.
Also, longer warranties can be a selling point (speed queen does this with the same exact internals being sold with a higher warranty on the 'fancier' ones which just add some more features to the board).
And, a company has to hold monies on the books for warranty service, so a defined warranty period that is not unreasonable can help with that.
But the "best" company in a given market only needs to warranty beyond the nearest competitor.
Speed Queen also is implicitly dealing with people who would buy the "lifetime" warranty residential unit and run it in a commercial setting, where the wear parts would wear out.