AIRBUS designs a damage tolerant system of structures. The entire airplane is way more flexiable with the cracks being taken into account vs treating every crack as a massive failure.
Many Airworthiness Directives (AD’s) from AIRBUS in the EU system allow for the cracks to fly for years prior to fixing them. The US systems denies cracks exsist and when they do show up the airplane is downed or given an exemption to fly on.... the US system is eye wash to protect the FAA and others in the event a problem occurs, the EU way of looking as crack is way more realistic, they happen and design a system to handle them and repair them when necessary
I say this as a former structural engineer on a fleet of airbuss, boeing 727’s, MD-11’s, DC-10’s etc... been there done all of that on many large airframes, US passengers would cr@p if they only knew what they are flying or what is flying overhead every minuete of the day. Still realitively safe, a testiment to the design engineers, not the FAA or the operators.