> "Boeing and Rocketdyne more or less hated one another," one person involved in the test told Ars. "Everyone was in super-defensive mode even before this happened. It had been classified as a risk, but the two sides weren’t talking openly and honestly about it."

> What was the source of the animosity? After Boeing selected Rocketdyne, according to sources, it asked for changes to some system specifications. This prompted Rocketdyne to ask for a change order fee, as is customary in government contracts. That infuriated Boeing, which thought it had a partnership with Rocketdyne, but the latter company saw itself as a contractor. As a result, the Boeing and Rocketdyne teams were effectively walled off from one another and did not iterate together toward a more effective propulsion system.

https://arstechnica.com/space/2024/05/the-surprise-is-not-th...