I believe our company tackles this issue wisely. Each employee has a manager that practices reactive management. But each employee is assigned to a team and each team has a lead. That lead practices preventive management. This combination allows for the good in each style of management to be used and the outcome is a smooth and complete work effort. The manager oversees a couple of teams, makes presentations and focuses on the high level things like cost and efficiency. The lead member deals with things happening now or happened already. He deals with project details and work being done and already done and the delivery of that work. Each one had their part and it is a lot more efficient this way.