My line of reasoning is, "If it's so good, why didn't Picard already do it?" Since Picard didn't do it and I know thjat Picard is a very good commanding officer, then I can only conclude that a four shift rotation isn't necessary.
Pretty poor line of reasoning.
It implies that every situation is equal and there is only one "correct" way to do things.
Picard was running a peace time explorer/diplomatic taxi. Jellico was gearing up for what could have been full-scale war.
Plus, we have no proof that Picard switched back to three shifts when he returned to command.