Do you believe the availability of wifi for staff/guests is somehow unreasonable? Or, is there a belief that no internet (wifi or cellular) connected devices are allowed on premises? Is them using cellular data, rather than a guest network, somehow more secure?

No idea. I’ve never been to the White House. For all I know they have an Potus WiFi and Aides WiFi and a EndlessFoxNewsAndRacistMemes WiFi. Maybe there’s also a Peasant WiFi for the cleaning staff and press corps.