I don't buy into the game balance argument. In the same FAQ you reference, it was stated that "skinlink is not available, yet". This seemingly implies that skinlink is likely to make a comeback, especially given that "wires are cool"...
I think it's more than a little ironic that the FAQ states "don't get cute", when it then turns around and does the exact same thing (see above, wires are cool, folks!). And the fact that it's called a Wireless Bonus is exactly what I think is wrong with this rule, as I just stated; to me it should be a matrix connectivity bonus, not specifically wireless. Unlike some people, I just don't accept that an optical wire and a wireless signal do not have the same bandwidth, nor do I subscribe to the notion that somehow, because "I/O Protocols", a wireless signal is somehow "faster" (or has less latency, more correctly), than a hardwired system.
And I make no attempt at hiding the fact that I don't like this particular rule, rather quite the opposite.
As for your last argument, re-read the SR5 fluff, particularly the parts about security measures... Plenty of null areas in the zero-zones, and I'd be VERY surprised if the corps didn't make extensive use of wireless jamming technology, seeing as how it would easily hinder some of the pesky runner types who keep breaking into their compounds and stealing their shit. But that's neither here nor there.
Like I said; I can't wait for errata. And I have every intention of houseruling this particular bit of "game balancing" mechanic.