Because Boeing management isn't Boeing management. McDonald Douglas management is Boeing's management. There was a reverse takeover. Boeing bought McDonald Douglas but McDonald Douglas's executives ended up in charge.
So it went from serious engineers to serious bean counters. The failing company's lead management became in charge of the productive companies engineers.
No matter how much musical chairs they play in the executive suite or which new idiot they bring in to run, no matter how much is done, you can't unfuck this company.
The only thing you can do now is short their stock.
As a Washington native, this makes me sad. As a US citizen, this makes me sad. As someone who has watched the destruction of this company for years, this simply makes me think it's about time. So something else can rise from the ashes. But they've been losing competition to Airbus for too long. I don't see what's going to happen in the US to make them better. Maybe they get bought by Airbus and we all sing kumbaya.