A Profound Chess Tip
If the king does not lead, how can he expect his subjects to follow?
If the king would lead in the opening or middlegame then he would get checkmated easily because there are too many enemy pieces around.
For that reason your recommendation that a king should lead is only applicable in the endgame where only a few chess pieces or pawns are left on the board and no real danger for the king exists.
In other words a king can and should participate actively in the game only when there is no real danger for him to get into trouble.
Example: In this position the white king is leading and runs to h5 and captures the h6-pawn. After this the g-pawn will become weak and is lost as well. White is winning.