Re: And the band played on!
True, but if it can "race to idle" the average power draw may be close to the idle power rather than active. Even the time to resume from full device sleep is lower than the average access time of a spinning disk.
The question becomes how fast it can recognize that it will be idle, and what the proportion is. Hard disks may remain a good choice for steady but not huge workloads over large contiguous data. Which includes many file serving operations.