Let me try to explain it.
Being reactive is not a tragedy by itself, but it is a tragedy when the team is reactive BY DEFAULT. Which means the team struggles to switch to attacking mode when needed, because they play reactive even in games where they are supposed to be favorites. Real are masters of both proactive and reactive game, which is why they are so successful. But you will never see Real play reactively against weaker opponents which means that unlike us it is easy for them to switch to ultra attack when needed, as they dont slow down when 1-0 up but instead go to finish teams off by scoring more.