Today, this is completely different story. When I’m talking with people who are still in esports and read news articles about current teams, they mention to have personal fitness couches and mental couches and I think it’s necessary for success as you can see application of these practices being successful in other sports - Tennis, Golf, etc. It’s even more crucial for team-based games (LoL, CS, etc.) where team chemistry, health of team members and ability to time your focus on the particular events are all important aspects for the overall success. I even heard that there is a professional LoL team which has a “synergy” coach who is dealing with day-to-day problems of team members and help them to resolve conflicts between each other.
It is incredibly hard to have consistent results on e-sports tournaments.
Edit: Grammar + Wording