WRT 787, the cracks were a consequence of two things. The new(ish) production methods involved in the aircraft, and the absurdly aggressive outsourcing of the production. The 787 is (was?) in many ways at the bleeding edge of carbon fiber manufacture. Combine that with the stupid notion their management had of sending out 99% of manufacturing outside of final assembly to dozens of different companies (as a consequence of contractors sub-contracting work) meant that they didn't find the design flaws until late in the game. This particular 787 issue doesn't provide any evidence of potential issues with other aircraft.