Here in the U.S. it is what it is because we, the customers, allow it to be what it is.
Where Europe gets 2 years labor and pieces, we get 90 days labor and 1 year pieces. And if and when an electronic part fails, it has nothing to do whether the first, second or whatever owner was playing it. A warranty exists for the sole purpose that electronic parts can fail within a certain time period and the warranty covers that incident.
Furthermore, now a days, practically all electronic devices store the number of hours they have been in use, be it that only service personnel can access this information, so there should be no date set on warranties, but hours of use.
Someone who plays outdoors for a living can have his keyboard working over a thousand hours a year, where I as a hobbyist might only reach half of that, yet both warranties run for the same time period.
My 2 cents.
Have a nice day