Another problem that the 787 shares with the Comet, is the reluctance to build a demonstrator and test it, before embarking upon production airframes.
Wasn't part of the problem with the Comet that it
was a demonstrator (i.e. pre-production one-off) which was built to finer tolerances (hand-built rather than using the jigs and tools for mass production) than the final production run airframes, meaning that 'bugs' in the design did not show up until the Comet was in service?