What you are talking about is more about the eternal discussion of "buy vs build", but this is not what I am talking about. It seems like you are just looking for a rationalization of NIH. There is a lot of middle ground between "let's build something that depends on a dozen different frameworks" and "let's build everything ourselves".
What I am talking about that if you have a good solution to the problem that we (as software engineers) are supposed to solve, then by all means take that solution instead of focusing on re-implementing it. "The exercise is left as an exercise to the reader" is fun and all when we are still in college, but when we start talking about the progress of your career, the industry and society in general, please don't waste your precious brain cycles working on something that has already been done.
What I am talking about that if you have a good solution to the problem that we (as software engineers) are supposed to solve, then by all means take that solution instead of focusing on re-implementing it. "The exercise is left as an exercise to the reader" is fun and all when we are still in college, but when we start talking about the progress of your career, the industry and society in general, please don't waste your precious brain cycles working on something that has already been done.