Airworthiness is a risk management process. The aim is to manage the risk to a level that is both tolerable and as low as reasonably practicable.
Perhaps a more simple test would answer your unspoken, and unanswered questions: was the airframe and engine combination fit for the purpose for which it was it intended?
Patently not.
Modified and altered from the original Comet airframe and engine combination, additional components added and finally made AAR capable, yet without any apparent stringent examination of potential problems or technical competence.
Years of make do and mend for the RAF may finally have reached their peak: the " press on regardless attitude" of Their Airships, "Of course we can do it" WW2 machismo is not, and has not been, valid for many, many years.