Why would I use a lightning cable when getting data on or off the device is faster over Wifi. It's kind of a trick question, why don't you use this slower protocol? See no reason to upgrade it no one uses it!
The exception to this -- and there are exceptions -- tend to be "pro" users. If you're actually using the iPhone for video production in any way, USB 2.0 is a brutal limitation, and has long been a noted annoyance when you're transferring massive video files. Lucky for those people they'll be Pro buyers and will enjoy USB 3 (and maybe WiFi 6E? Not sure if this was delivered).
THIS is a trick question.