If you're a minimalist type of person, then you might prefer to keep your Mac's desktop free of any icons.
Yes, you can easily drag documents and other files that have been cluttering your desktop and put them in a folder on your Mac. However, that doesn't change the fact that icons for external hard drives, USB thumb drives and other hardware devices will still pop up on the desktop as soon as they're connected to your Mac.
Wouldn't it be nice if you could do something about that? Thankfully, Apple's engineers though of that, too, because macOS makes it easy to optionally remove desktop icons for different types of devices with just a few clicks.