Don't recall Rodimus using Matrix being used like it was in the Bay movies - whipping it out and jabbing into a dead Transformer or bringing it near machinery to create life. In Season 3, there were some badly written life-creation episodes; Metroplex being built through hard work; Grimlock building the Technobots from parts within Unicron's head; and then there were fallen Transformers being brought back to life by the Quintessons.
I guess that's like why didn't Optimus Prime in Season 1 send all his Autobots to crush the Decepticons in one fell swoop, when he had the military advantages of a proper base of operations, fleshling allies, and a 3 or 4 to 1 ratio superiority in numbers :p