Also the amount of stuff the firmware does nowadays, especially on a laptop, is quite high. The OS-UEFI interface is quite complex and involves a fair amount of firmware code which keeps running after boot. This code is heavily involved in operations like suspend and hibernate, and is usually developed by the laptop OEM themselves, so quality is not very high and they have little incentive to test with anything other that windows. This results in a tendency towards fragility (even with windows), as well as worse battery life under linux.