On the one hand, it can help you to establish your own article system, that is, you have already thought about how to write the article before you start writing.
For example, medical papers, if you are doing basic experimental research, you may have begun to brew subsequent writing in your mind after getting some results. At the same time, you may consult a lot of literature, combine the literature with your own achievements, and draw some conclusions. According to some collected evidence of why you came to this conclusion, you will lay the foundation for the following writing together.
These need to be supplemented and adjusted at any time before or during writing, but with this outline and framework, it can be gradually enriched.
On the other hand, in the process of outlining, it is likely that new problems will be discovered constantly, such as finding that logical reasoning can not go on, or contrary to previous research results, and so on.
At this time, it may remind you whether it is reasonable to review your topic, which will prompt you to think more questions, so you need to consult the literature more widely. This process will not only make you gain more and more comprehensive knowledge, but also the article tempered by such repeated argumentation will eventually be a scientific, practical and feasible article.
On the contrary, if you haven't made an outline and made a general deduction and analysis before, you are likely to follow the assumptions you took for granted before. It will be a great waste of manpower, material resources and financial resources if the whole topic is finally found to be problematic.