In some ways, Season 4 was what Seasons 1 and 2 should have been. We could have seen the bungled first contact that led to strife with the Klingons. The Tellarites could have been introduced early as was done with the Andorians. The events of "Minefield" could have been the beginnings of the Romulan War. There was so much background already established, the Temporal Cold War was unnecessary.