Last year in the NHL and NBA Playoffs, we saw two teams make it all the way to the Finals in each league respectively that probably shouldn't have gone that far. Both the Florida Panthers and Miami Heat were like the 7th/8th place team in their conferences. Both teams lost to the superior teams in the Finals (Las Vegas Golden Knights and the Denver Nuggets). You are starting to see more parity across all sports since more teams do make the Playoffs and you are seeing lower playoff seeded teams going on runs for a couple of rounds knocking out the top seeded teams. Owners and the Leagues want more teams to make the Playoffs because that means more money. It happens in any sport, whether it's hockey, basketball and even soccer like at a World Cup. Only sport where you don't see that too often is in the NFL Playoffs.
Since 2000 in baseball, World Series winners who were the WC teams were the Anaheim Angels (2002), Florida Marlins (2003), Boston Red Sox (2004), St. Louis Cardinals (2011), San Francisco Giants (2014), Washington Nationals (2019) and the Texas Rangers (2023). 7 in 23 years. Those earlier WC teams were the 4th best teams in their leagues, so definitely a lot closer to the elite division winners. Even when the one game WC was announced in 2012, only the Giants and Nats were the two teams to go all the way.
The difference now in baseball is that more teams are allowed in, so you will have weaker borderline WC teams sometimes in the World Series. You likely will have a team like the D'Backs every so often go on a run, knock out a couple top teams and make it to the World Series. Same happens in the NHL and NBA with 8 teams making it. That's what happens when you allow more teams in to compete in the Postseason.