I was wondering the same. If Wifi meant no cables needed at all, I could see it (because of lower maintenance costs). But the electricity needed for Wifi and the motors in the mirrors requires cables anyway.
Wifi also allows technicians to connect to which ever devices that they are monitoring more easily and if they will have wifi for easy onsite access they might just as well pull everything over wifi.
It's quite common these days to pretty much run industrial monitoring over wifi it reduces quite a bit of costs as the technicians can just come with a smartphone or a tablet and connect to the web interface or use some dedicated diagnostic app it's much cheaper than sending them out with laptops and connecting directly or having them to use even more expensive dedicated diagnostic equipment.