Sounds like a communication / planning problem. What is your process of planing and carrying out a project and are those processing being properly carried out?

Sounds like a communication / planning problem. What is your process of planing and carrying out a project and are those processing being properly carried out? It sounds like the engineering team don't have a clear vision of what they are supposed to build. This leads to them building the wrong thing. The people who wrote the initial brief don't see a problem with it but do see the engineering team struggle with the project, not knowing how to explain their vision they resort to micro-management. Having a non engineering person trying to manage an engineering problem at a micro level will result in all the problems you describe. The developers are missing the big picture and will have to guess, redevelop, then test it on the non-engineering person, repeat until they say yes. This introduces bugs and tones of useless code.