Yes, most scientists have common sense and practical minds. They are trained to look at questions and solve problems, so they are naturally always thinking of how something works and how it could work better. If something can be accomplished in a more direct and practical way, a scientist is likely to discover it.
Most scientists like to think of better ways to do things. They have more common sense than most people. Their common sense might seem small in comparison to their uncommon sense, but that is just because they are so much smarter than most people. Scientist have usual skills and special skills.
Adding an egg to soup is not really a great idea. The outside of the shell is often contaminated and should be washed thoroughly. Many highly intelligent people over-analyze things and overlook details that make their improved method of doing things impractical and less efficient. Trying to save a small amount of energy can require more.
I don't know why adding an egg to his soup was such a great idea. Egg drop soup is disgusting. Also common sense is a myth and is based on things that we are taught when we are young, which vary from culture to culture. There is not really any such thing as common sense.