Design-by-committee is a real phenomenon, especially in government projects where a committee of elected representatives establish and control budget decisions. University of Southern California course SAE 550, "Systems Architecting and the Political Process", is a survey of engineering efforts that have been heavily influenced by design-by-committee.
The course covers a number of case studies from the aerospace industry. For each case study, the initial goals are described, an optimal engineering solution may be described, and the impact of politics on engineering decision-making are explored. The course presents a set of design heuristics that engineers can use to accommodate the realities of design-by-committee in the political process.
It may be worth your time to contact the course instructor to request one or two case studies. The Space Shuttle case study includes fascinating discussion looking at how conflicting Air Force and NASA requirements for the size of mission payloads impacted the Shuttle's cargo bay. Various other factors are considered to explain how the Shuttle went from a reusable, high-frequency launch platform to a low-frequency launch platform.