The reason he uses these teams often is because they have synergy and they work well with these meta defenses and at the end of the day we all want a good score. So he can use whatever he wants so if you don't like it go watch other channels with different team compositions.

I would also like to use more diversity ... but I want to ensure the best results for my alliance and the current meta is difficult, so if the heroes are often the same it is because these teams have all been deeply tested and they are the best of my roster