You can only go so far, or accomplish so much, on your own. It takes teamwork to achieve something great.
Teams (especially large teams with many decision-makers) can take a long time to decide and act on something. It is easier to move quickly when your team is small or you’re by yourself. But you will be limited by your time, energy, and mental capabilities if you only work alone. If you work with a team, with each team member having their own strengths and bringing something valuable to the team, you can achieve something larger than any one person.