Does brainstorming have any benefits? What are its disadvantages?

Brainstorming is a form of creative thinking in groups, using a procedure in which all group members are encouraged to generate as many ideas as possible without holding back or worrying about being wrong. They are also encouraged to build on each other's ideas. The core assumption is that creative people can feed off each other's thinking processes and creative energy, thereby coming up with more and better ideas than could the same number of people working alone.
The benefits of brainstorming have been gradually confirmed by careful research.Compared against the same number of people working alone, people working together in a brainstorming group session enjoy the process of generating ideas more than people who toil alone. When they finish the work, they evaluate it more favorably, rating it as more creative and successful. People who work alone but hear about brainstorming groups also immediately recognize the advantages of brainstorming and express the belief
that they would do better if they were in a brainstorming group.
But that's all. The brainstorming groups only thought they were better, and they had more fun. When researchers actually check the quality and quantity of ideas, the performance of brainstorming groups is quite disappointing.A meta-analysis that combined the results of 18 separate studies concluded that the output of brainstorming groups is substantially lower than that of people working separately. Eight people working individually produce more ideas than eight people brainstorming. Nor does brainstorming increase quality by sacrificing quantity; the quality of work coming out of the brainstorming groups is lower, too. In short, brainstorming does not improve creative output-it reduces it.