Operative words there are HDD and LAPTOP. Windows is a 'one-size-fits-all' OS. It works on laptops, desktop, tablet, phones. Laptops, especially with hdds, need every battery saving option available. A simple boot, using the processor as it does the hdd as it does, takes quite a while and a lot of juice. Even a startup from standby sucks on the battery. So hibernation makes a lot of sense in time / battery life savings.
Does next to nothing for a desktop that's AC powered and uses a SSD for boot drive except for save a few seconds (literally) and eat up space / read-write life for no benefit.