Taking into account the context before the bullet pointed "typical statements": there are developers who seemingly like to gatekeep. They get to feel like wizards in their towers with their dusty books and potions [...] My point is our egos can “leak” in so many ways that it takes diligence to catch it let alone correct it.

It's a bit of a Chesterton's Fence situation. The wholesale statements themselves don't point to having an understanding of the pipeline, only that the person making it supposedly knows better than everyone there and is self-justifying or "leaking" their ego instead of engaging in discussion about it