Mitsubishi Heavy built the wings for the 787. Boeing, in a rare moment of stupidity, outsourced the manufacturing of the wings (the internal policy has historically been "The wings are the plane" so outsource anything BUT the wings and we are cool).
So about the time the first 787 prototype rolls off the lines, Mitsubishi announces their Regional Jet.
He was calm about this every time I brought him an article about them making progress. It's a Bombardier class plane, it doesn't really compete with Boeing. And they need a lot of commuter jets in SE Asia so they'll sell a lot of them, sure, but it's gonna be a while before they build a plane three times as big.
And as it turns out, it took them a very long time just to build their first plane. Now, I don't believe the Japanese "school of business" is fond of people bungling a project and having no idea how to avoid all the problems the next time, so we could get surprised by a much faster turnaround on the next one. But they're still way behind schedule.
Is it really "Boeing" anymore or more MD?
One hypothesis around the 787 problems I heard was that post-acquisition, all the MD people ended up in important positions (reverse take-over a la Apple and NeXT)
So when the Dreamliner program came a long it was developed under MD's more business-y thinking (outsource risk) instead of Boeing's engineering thinking (learn in-house). Then they had to put together a ten thousand piece jigsaw from hundreds of suppliers with varying tolerances.
MD was/is a defense contractor first and foremost and the most important thing about defense aerospace is spreading the grift over as many congressional districts as possible. This makes total sense when your clients are 100% political. It makes zero sense otherwise.
Notice SpaceX can build big rockets on the cheap and keep a schedule? Yeah because they do everything in one place unlike NaSA and it's contractors that have to spread everything all over.
They cannot. Your statement is actually kinda funny, since "elon time" is its own meme and ULA uses "Schedule Certainty" as one of the main talking points to distinguish themselves from SpaceX (see  as an example of the ULA CEO doing exactly that on the SpaceX subreddit)
You mean compared to NaSA and it's aerospace contractors? Cause that's what matters.
I believe it was also said after the fact that the process for the 787 was a huge mistake and they'd never build a plane like that again.
Silver lining I suppose.