On top of a poor personnel culture, Boeing cares more about splitting it's supply chain up around the world (in order to get contracts from different countries) than making airplanes. The scary part of a bad culture is you could fake it with past airplanes, but newer aircraft with lighter composite parts/less parts (which then make each part's integrity more important) there's less wiggle room. Plus with composite, you can't just do a final QA on things and ensure they are good. You have to QA each layer layup, glues, etc. An xray at the end can't really give you the whole picture. I remember friends talking about how a certain (not Boeing) company was experimenting moving composite layup to China and what a cluster that was going to be. They would find razor blades embedded inside and all kinds of FOB crap on the final xrays, and this was on the pre-production showcase pieces.