When you have a tablet, you can do things like punch in what defense the other team just used to provide statistical analysis of what the next best play is, or what kind of defense to run if your opponent is doing X often. These are things a coach can know, or have on paper, but the ability to quickly look things up for an effective response or plan is probably very beneficial.
What I don't know, however, is why they would need "connectivity." Why do you need wi-fi operating your iPad or Surface if you have all of the relevant info on the device? If they don't have all the relevant info on the device, what do they need it for?