I think it's a marketing strategy. They are not providing an update so that Zenfone 6z must be a choice of a new buyer. Because both are flagship devices. At this price point 5z is value for money product. If it will get an equivalent update. May be the potential buyers for Zenfone 5z might increase. Although, this has ruined the thought of buying a flagship device. As Samsung and many other companies provide the latest updates on their flagships. Like the superb update on galaxy note 8. It has thoroughly improved the device's performance.
