As a coach, you've also got to learn which lineups work best and which lineups to avoid. For example, Tibbets the entire season couldn't figure out that Taurasi, Griner, and Cunningham on the court at the same time was the worst defensive unit in the league against teams with stellar guards. Cheryl Reeve during the olympics saw that Taurasi/Grinner/Plum was also the worst possible combination to have on the floor and it didn't happen at all in the gold medal game. You can't always play your best players against every team because sometimes your best offensive threats may not be able to guard the opposing team in certain combinations. This is a coach's job to know this.