It's not as if you run into Deckers all the time on a run, so most of the time you'll be fine. Unless you're running into a corporate facility and the Spider spots you and tries to run interference, it will be rare to be targeted since Decks and Jacks are expensive, so a skilled decker is rare, even on opposition of runs. So yes, wireless comes at a risk, but it's a calculated risk, not a 'whenever the GM wants, you're effed' risk.