You know what’s cooler than an expensive thing? A high quality thing with higher margins. A very well known and highly profitable company has taken that model pretty far (like trillions in valuation far).
Engineers arent really responsible for these types of attitudes though. Management are. By and large engineers will do as they are requested.
I find it far more plausible that costs ballooned due to an empire building dynamic by management than because engineers arm twisted them into building something "cool". Same reason Uber has, like, 150 people working on a mobile app.
Engineering is all about fitting within your constraints. Make budget one of those limits and life will uh find a way.
Well sure, you literally just removed the cost optimization variable. SpaceX vs. NASA is a clear example demonstrating that engineers can do this sort of optimization when it's given to them as a constraint. NASA's rocket designs were all custom, single-use, often down to the bolts because the budget was per-project/launch, where SpaceX rockets were designed for reuse and cost minimization across multiple launches.