Regine Gilbert emphasized the importance of inclusive design. Inclusive design is the usability aspect of all engineering products. This could include a range of usability features such as the use of ramps along with stairs, railings on said stairs and ramps, the ability to use the product with only one hand.

A key aspect of inclusive design is when you as an engineer/product designer are brainstorming prototypes, think about who is going to be using your product. Something to remember (that Regine Gilbert specified) is you are not your user. 

When I was young I was diagnosed with dyslexia which made it unbearably difficult to concentrate on reading. I have found that I have the easiest time reading when I am reading off paper or an off-white background with black text. Any other combination of background/text colors is too distracting and interferes with my experience. People in the world with dyslexia might be a minority, but if someone wants their work to be read and used by others, keeping in mind what is easy for people to read allows for many more people to make use of the work. Additionally, no one would ever put red text on a green background because those who are colorblind most often mix up the colors red and green. 

Overall, inclusive design is a concept all engineers have to think about (hence why I picked the picture above because I thought it represented this well) while working on products that will be used by anyone. Again: you are not your user // your user could be anyone.