This is a rather arrogant point of view. People other than software developers are able to solve problems just fine, and do so regularly. Also, it's not your job as a software developer to be a domain expert in all these other areas. It would serve you much better to recognize the expertise of others and learn from them.
I think what the parent meant is that people might be solving problems, but they have no idea how they are solving problem. Creating a solution, and creating a formal model of your solution, are two different (independent) skills.
Though maybe they were referring to the sort of people who commission green-field projects in domains they themselves aren't experts in, ala "I want to build a social network!"
