Bear in mind, that was the Vista days, and Windows 10 now supports even more devices. 800MB of drivers at the time. I would not be surprised if Windows supported by default upwards of 10000 drivers. It works pretty much flawlessly on even somewhat obscure and old hardware. And when your OS is installed on that many consumer devices, and not informally standardized servers, you are going to meet those weird devices one way or the other.

Windows drivers may also take up a bit more space individually because of the overhead caused by either the Windows Driver Model or Windows Driver Framework, but that's the price to pay to not have a driver crashing and bringing down your entire system. Yes, Linux, I'm looking at you.