Baseball is a much more random sport than the others. Only hockey is even in the same ballpark. And I will never understand why people fight so freaking hard to deny this notion.
Baseball in small samples is full of so much noise it's impossible to derive patterns. The playoffs are just a series of small samples. Pretending there is some grand logic to that when you would never do that with 5 random games in May is absolutely bonkers.
Atlanta isn't the exception. That crazy stuff happens all the time. Hell, I bet you THINK you know that teams repeating are doing so for a reason. Yet the Dodgers, who made it three out of the last five years, did so in completely different ways.
2017: They rode Bellinger and Turner offensively, but Yu Darvish who had gone 2-0 with 11 innings of 2 run ball prior to the world series, absolutely imploding against the 'Stros
2018: Muncy, a dude who wasn't even in the big leagues in 2017, rides them there offensively, but Kershaw and Ryu spend the playoffs getting shellacked.
2020: All those dudes above? Non-factors basically. They rode Will Smith, Seager, Betts, and the one year Kershaw didn't suck.
Again, you wouldn't pick 5 random games in May and declare from your mountain top "This team shall be named champion. They have earned it clearly with this small, totally representative sample" Yet, that's what the playoffs are. In other sports, where less random crap happens, that makes sense. In baseball it's just silly.