Wouldn't the real use-case here rather be battery powered devices? While RAM on a modern laptop will only use a few watts at most, which is little compared to

Wouldn't the real use-case here rather be battery powered devices? While RAM on a modern laptop will only use a few watts at most, which is little compared to other components when under load, that still accounts for quite a big chunk of total power usage while most of the system is idle, such as during light usage and with display brightness on low.