I agree but they won't. Frankly, I think they slow update roll out purposefully when a new device is out. This is because they know that device upgrades now are merely incremental and in the real sense of the word aren't really upgrades merely a shining new iteration of the old device save few enhancements. Therefore, rolling early updates to older devices would definitely eat into the sale of the fresh devices as people would see no reason to upgrade or buy the newer device when the second hand market is saturated with way cheaper devices with the same software