ChromeOS and Google are super creepy because of how data hungry they are. That said, one of the advantages is that if they have committed to a 10 year lifecycle, and they have a new feature that is awful on an older device for performance reasons, they have an incentive to implement a feature that executes that slow function using cloud compute resources when the device is connected to maintain their lock on customers.

It really depends on how Google assesses the value prop of supporting older devices.