There are two distinctively different categories of multidisciplinary optimization. The most recognized category is quantitative in nature. The second category is qualitative in nature.
Optimization is management's job.
Everybody wins with optimization. In the context of an electromechanical system, the idea is to find the best electromechanical system solution, not the best mechanical solution or the best electronic solution. In design for competive advantage the objective would probably be cost, quality, or value, which is a combination of the two. From a mathematical perspective, many constraints would be the equations governing the electronic behavior, the mechanical behavior, and any coupled electromechanical behavior for the system. Other contraints could be limits for certain variables dictated by current technology.