Where there is too much ego, there is bad design.
Onur Cobanli explains:
Always design products and services you would enjoy yourself. Never design a product or service you wouldn’t enjoy yourself. Always design as if you are designing for yourself. Never design anything that you wouldn’t use personally; Sure design things like medical products that you would hopefully not need to use yourself, what I mean is that always design the products and services in a way that if you were to use them you would enjoy them.