Peak power is significantly different from operational power on many of these setups. The intel setups, frequently idle at a 1/10th or less the rated power. The rpi4 OTOH, isn't nearly as dynamic, particularly if your running 64-bit debian. Its still just a few W, but its not going to drop down into the mW range when its idle because debian/etc doesn't have particularly good power mgmt on that board.

So in the end the rated W can be quite misleading, particularly for home use where the NAS will tend to sit idle a large part of the day.