I believe many more cases of 6+ phones bending will be reported over time.
Most everyone who gets a new gadget will baby it. If they put it in their pocket, they will keep that fact in the forefront of their mind and be very careful bending/sitting. However, over time as the excitement wears off, people will often "temporarily" forget they have the phone in their pockets.
So when things happen like someone drops something and you instinctively bend down to pick it up (especially if she's cute) you could end up with a bent phone. For people who do not put their 6+ in their pocket; three months from now, you may make a split-second decision and slip the phone in your pocket to help a friend carry some heavy items from his car to his apartment. There are many,many examples of normal behavior that will result in the phone being put under physical stress.
The issue is the threshold of force to bend the 6+ is too low.