Imagine you are sitting at the dining table. You and two friends are trying to have a conversation. The one friend is screaming at the top of their lungs. You and the second friend are trying to talk normally.
How easy can you and the second friend hear each other over the screaming one? Turning the Zigbee power too high is like your overly loud friend. If everyone talks at the same level, it all works out fine.
There are times where you might have to talk louder in certain noisy environments, but just cranking it up because more=better is a bad strategy.
