I can take my index finger, and my thumb, and squeeze the top tube of any CF bike in the middle of the tube and get the tube to flex on a road bike, I can't do that with any other type of frame material, just CF, and that's why you have to be real careful to make sure you are using the correct torque specs or you could crush the CF, and crush it in such a way you don't even know you crushed it, till have X number of rides till it suddenly fails leaving you scratching your head, if still can scratch your head, over why it broke. So that nonsense about 5,500 Mpa is just that, nonsense used in marketing to erase peoples fear of CF.
https://www.irishtimes.com/sport/oth...ries-1.1879653
https://www.roadbikereview.com/threa...carbon.377783/
This video is funny but it makes a point, just click on the play button and enjoy:
https://vimeo.com/106021360