I fly a composite GA aircraft , much smaller, not the speed of an 350/787 of course, but cracks in the surface are not uncommon because the 2K paint typically used is not exactly as flexible as the composite it covers. Not nice to look at and needs repair as moisture gets into the cracks, but not really a safety issue. But I do not know which paint /primer they use on 350s/787s.one would expect they had an engineering solution to this as this phenomenon is known.