I am not sure if I understand your question. If I did, your thesis would be a good, even excellent thesis, if it answers say to an irritating question, that is, a question whose answer leads us to a better knowledge of the unknown. If this if the case, then you have a thesis. Of course, your irritating question can be said in less than 3 minutes.
No, we don't need it. The challenge might be good preparation for various things: it can help you organize your thoughts, learn to communicate effectively, gain confidence, and advertise yourself. But you are a free agent and you can do something else or nothing at all. Maybe you already have those skills and don't need such activities to develop them.