I don't think it is necessary for beginners. Because when you first learn guqin, you should pay attention to basic skills such as fingering. Just like practicing calligraphy, you have to be able to write before you gradually know the knowledge contained in calligraphy, right?
Self-discipline is definitely necessary, otherwise you can only learn guqin from the perspective of techniques, but you can't go deep and be refined. There were many talented singers in ancient times, including Fang Yue Guqin, but why did Ji Kang, a "literary youth", finally praise them? Think again, what about the old singer in the pipa? Awesome ~ But we can see from the article that her life and psychological condition are very miserable. Why? Because her pipa level is not for interest, but for survival, so her pipa skills will always stay at the technical level, not the spiritual partner level, right? Of course, this should also be considered at that time. After all, not every woman in those days had a chance to become Li Qingzhao.
However, the accumulation of culture should not be urgent, because it should be done slowly. If you have time, it is certainly beneficial to know more about ancient culture and history. As for the demand for cultural skills, it should be your desire to learn about guqin and culture through study ~ it is your interest and thirst for knowledge about China culture and guqin culture. There may be no binding connection between the two, but you will understand the feeling of learning and wanting to know.
My feeling is that you can't learn Guqin for the sake of learning Guqin, and don't read Tang poetry and Song poetry for the sake of accumulating knowledge. You should turn reading into a pleasure. Otherwise, it's no use watching it or not. You can practice guqin as a skill. After you practice, say I know a craft.
We learn these things to enrich our lives and improve our taste and cultivation, right? Tang poetry and Song poetry, as well as historical knowledge, all serve to enrich our connotation. Only when the spiritual realm is improved, Guqin will truly become a good friend in your life, and so will poetry.
From what you said, I believe you are not just going to learn guqin as a skill. The suggestion is to make a long-term plan. Guqin is really a lifelong interest ~