Why shouldn’t people use windows?
You can’t expect the average person to be tech savvy enough to use Linux and most people cannot afford a Mac. Especially in developing countries.
Windows is the best OS for the average person. Just not for advanced users such as researchers
You don’t need to be tech savvy to use Linux there are more than enough distros where you need as much knowledge as you need to use windows I wouldn’t call everybody how owns a steam deck a tech savvy person. The only user friendly advantage is that Windows comes for some reason preinstalled on almost every device. If this weren’t the case and the average consumers had a choice the picture would be very different.