Classic pattern. The board gets populated by people whose main skill is board politics, and they use governance tools to push out the people who actually build the thing. Seen this happen in multiple open source foundations.
On the other side of things, i've seen plenty of examples where technical people try to manage things despite having no administration experience and screw it up.
That sounds like what happened at Boeing.
This is anecdotal at best, but it does play into the tired old technical vs non-technical simplification. The fact that the two entities have now become direct competitors is a better explanation grounded in facts