I have a bachelor’s degree in Mechanical Engineering and a masters in Industrial Design. In engineering school students are not really taught how to design products. Engineering students are taught a lot of math and science. In the process they become very good at breaking problems down. When an engineering student graduates and is asked to design products they are going to make products that meet specifications, that will not break and can be manufactured. They are not very good at making products people want to use. I guess sometimes industrial designers think that they can do design engineers jobs because if a product does not require calculations then the education an engineer has completed has really only indirect benefits. These indirect benefits include being able to break down a problem very well and understanding physics much better than their Industrial design counterpart. An industrial designer could not be a design engineer at a place that sells lifting beams because that requires calculations to make sure the beam does not break and no one dies. Design engineering in my opinion is applied science and math.
Industrial designer’s education teaches them how to create experiences that connect with the products user. Industrial designers do this through understanding the users’ needs and wants. They create objects that are aesthetically pleasing easy to use and ergonomic. They learn how to innovate and create new products that solve users’ needs and wants. Engineers do not have the training to make aesthetically pleasing objects. They are much more focused on what makes the most logical sense in terms of money savings and physics. Since emotions are not logical engineers can completely ignore emotions therefore making products that no one wants to use.
I do not think that designers and engineers understand the need for the other profession because they think so differently. Doctors have the same med school education then they break off into specialties. An industrial designer might be focused on art his whole life and then majors in industrial design. An engineering student might be focused on math and sciences his whole life then majors in engineering. There is little overlap in education.
Both Engineers and Designers can be very innovative, but one deals with user experience and the other deals with making things work. There is a little overlap, but without training in both nether can come close to being able to do what the other does. A lot of people have talked about the importance of the intersection of humanities and the sciences. When you combine engineers and designers that is what you get. Both are most effective when they work collaboratively together.