For college students' competitions or other amateur competitions, everyone generally pays great attention to defense, so it is particularly important to arrange a suitable formation according to the players' ability. As long as they don't lose their positions and cooperate with each other defensively, the whole formation is not easy to be penetrated when the attacking players of the other side are not very strong. At the same time, the offensive style of amateur competition is relatively simple. As far as my experience is concerned, the offensive end is not so demanding on the formation, or there are more choices. You can move forward step by step according to the formation, and then get the fighter through sudden changes. You can also play alone, or share it with several capable friends. Others just need to defend well (that's what we did on the college team).
To sum up, personal experience feels that formation plays a greater role on the defensive end, just like a shield. You should block the spear attack as a whole. How to adjust yourself to deal with the rhythm change of others' attacks is the most important thing. The key lies in the overall movement and personal standing awareness, and there are no loopholes. On the offensive end, it is understandable to carry out a certain number of ways, but the overall promotion formation is too rigid. Strong teams will emphasize the variety and diversity of play, and only by surprise will they have more chances to score. So at this time, the role of formation is not so great.