Yes, PB is still an issue. Prior to purchase, I was really concerned with this too; but after driving the car for awhile, I pretty much can anticipate when the car might brake. The usual suspects are overpass shadows, auto carriers (but not solid tractor trailers for whatever reason) in my right adjacent lane, and (mostly large) vehicles exiting right in your adjacent lane. I’ve learned to disengage AP when in the vicinity of these things, keeping my speed, and then reengage AP. I just took a 1200 mile round trip to NC from NY and back, and only had two unanticipated PB events, neither particularly jarring. YMMV.
What did bother me about my trip was the new emergency vehicle recognition. While in the left lane of a two lane stretch on I-95N, with not many other cars around, I got the new warning on my display, and the car quickly decelerated from 80 to 45 about two to three miles back from the flashing lights on the police car, which was completely off on the right shoulder, leaving the right lane open and unobstructed.
Happened twice.