As you know all company's have different departments and usually they have to work together. As you guess each department is responsible for specific products. While they are in a meeting, several departments check their screen and want to inform the others or while one group take an action other group montior the outputs of this change. Since we only share one participant's screen there is no option to view both departments actions.
If we add concurrent screen share ability at least for two participant it will be a game changer.