The first, of course, is that having a team is more likely to win trophies. Personally, if you want to get a trophy, you can only lose one or two points at most in the 7 rounds, which is very difficult. The team is different, because it counts the results of the top three in your grade in your school. Even if your own performance is not satisfactory, as long as three people in your team perform well, you may win the trophy. And not every school has teams, so the competition is much smaller. A section of more than 200 people may only have 20 or so teams. The probability of winning is greatly increased.
The second is the sense of honor of the team. You fight for the team, not just for yourself. Individuals can give up at any time, and come back next time, but for the team you have to try harder, maybe one more time or one more minute. There are so many eyes on you, so many people looking forward to your victory.
Third, teammates support and encourage each other. Teammates will not be matched according to rule, so everyone will do their best to help their teammates prepare and win. This is completely different from the general individual tournament, and it is another kind of atmosphere.
My daughter had been eager to have a team since she was young, but it was not until the 12th grade of high school that she led the chess club, and had the opportunity to lead the team to participate in the High School National Championship tournament in spring. She caught the last chance and her team won the 11th place.