For most the "USB passthrough" section at the end covers the need of plugging a device and/or a headset in without needing a full hubs worth of devices sticking

For most the "USB passthrough" section at the end covers the need of plugging a device and/or a headset in without needing a full hubs worth of devices sticking out of the keyboard. In general though the more functionally useful a keyboard would be the fewer options you'll find. I think a large part of it is many buyers are more worried about maximizing the aesthetics of the keyboard rather than creating a swiss army knife of a keyboard so that's what is easier to find.