I think their idea is you should use a wireless mouse. Notice that the "Fully equipped for a wireless world" heading appears above the mention of USB-3. Indeed, putting only one port forces the issue, because I imagine a significant amount of the time, if you're using a mouse, you're also plugged in to power, and now you can't do both without a hub of some sort.
Reasonable people can disagree wrt whether a wireless mouse is acceptable for their use case, of course. Just like reasonable people could disagree when Apple stopped shipping devices with floppy drives and (later) optical drives.
Reasonable people can disagree wrt whether a wireless mouse is acceptable for their use case, of course. Just like reasonable people could disagree when Apple stopped shipping devices with floppy drives and (later) optical drives.