From Honda's website:
Using proven, advanced technology from Honda’s automotive division, you get the benefits associated with a locked front differential with none of the downsides. That means it maintains front-wheel traction even if one wheel wants to spin on ice or mud or if it’s in a hole. But at the same time, you get the lighter steering, better tracking at high speeds, tighter turning radius, and reduced kickback associated with unlocked front differentials.
Clearly only the front wheels will have the brake traction control feature. No mention in the description of all 4 corners having it.
Jeep has had brake traction control for almost a decade in the Wrangler starting with the 2007 JK.
They call it BLD or Brake Lock Differentials.
It works well on our 2009 JKU. I enhanced it further by adding a Detroit TruTrac Limited Slip to the rear end of ours. The TruTrac is a torsen style limited slip that's all gears and no clutches to wear out. With the combination of limited slip and BLD, our Jeep acts like it's got a automatic locker in the rear end, but much smoother.
It is true that your brakes will wear faster... that's a given.
Still not sure of my opinion on the tech being introduced in a SxS. I've only been on one "real" trail riding trip in my P1K when I went with friends down to Nebo, IL. We did all of the hard stuff and I never locked in the front at all. Just stayed in 4WD all day. Seems like the i4WD option would be a little extra traction when needed without having to shift. But, at the same time I think it might be something else that can go wrong... one more potential point of failure.