Well said, this is what I try to explain to people, especially last year. Pitching depth in the rotation and the bullpen is great in the regular season but in the postseason your front three and back four in the bullpen will primarily determine your success, and when you match up against the other playoff teams a lot of the pitching advantage disappears completely because even if you're 4 and 5 are better, even if you're five six and seven in the bullpen are better, it really doesn't matter much.
Trying to win with just pitching and defense won't get it done unless you have multiple aces in your rotation and at least a couple of elite arms in the pen. We don't have this.