In a channel, the two nodes are partners. When my side of the channel is empty i raise my fees and my partner go down in fees and opposite when my side is full. I never rebalance as longe as the other node is “sleeping”
Discussion
Yes, but this only works if both nodes are on the same fee level. Often this is not the case and there is no or only a rare chance for natural flow.
But anyway, if you have a low fee your change to emptying the channel is much bigger than a high fee. Therefore it is not smart to have as in my example 0 or 1 ppm in a channel where your side is totally empty