[btown]

With hardware where power-off is only controlled by software, battery life is predictable, and large amounts of data like raw video are being persisted, they might have a very aggressive version of page caching, and a large amount of storage may imply that a scale-up of RAM would be necessary to keep all the data juggling on a happy path. That said, there’s no non-business reasons why they couldn’t extend that large RAM to smaller storage systems as well.

[marshray]

People without the "large amount of storage model" need to record video from the camera too.

The justifications I see are to reduce the number of models needed to stock and to keep the purchasing decision simple for customers. These are very good reasons.