You wouldn't miss the 1.2-1.9W on a gaming laptop with a discrete GPU. But for more mainstream systems with just integrated graphics, 5W is on the high end for idle power and even Intel's latest mid-range laptop parts can get down to about 3W if you don't have Windows doing dumb shit in the background constantly.

Also, on modern laptops you can't trust that components will be powered off when you close the lid, because Microsoft and Intel have been at war with ACPI S3 suspend for years now. So that 1.2W could easily be the minimum power draw of the SSD any time you haven't hibernated or shut down the system.