Secondly, a team would help you save time and resources. As each team member would have a different perspective, it would help you have the complete picture of your problem. Although some people think many people would lead to argument, I think this means you would be able to understand the problem clearer. Moreover, there are a lot of things you couldn't find in any book but your seniors.
And last but not least, nobody can work alone. No matter who you are, even a genius cannot finish all of his work by himself. A team is a symbol of strength, profession and solidarity. A good team is one which members can use their fortes to complete their tasks and support the others. That is what teamwork supposes to be. Although working independently is also important, if you isolate yourself, surely you would be left behind.