Yea you'd be surprised how much crunching and creaking carbon will take before it shows a proper weakness.
We have a test facility that bends and twists various parts and if you saw some of the angles and forces applied without failure of the carbon it is honestly frightening! You hear them creak and what sounds like cracking but all maintain structural integrity (well unless there's a fault).
That's why all carbon bits should come with some form of warranty as it is very hard to know where all faults are. You could have a thousand frames and two could have small voids in the carbon (gaps with insufficient resin or areas where the carbon layers haven't bonded 100%).
The 456 comes with a 2 year warranty on manufacturing defects so for those two years I shall put the frame rigorously through its paces
I may even do a bit of NDT (non destructive test to check for areas of debonding/voids)... Just because I can