You're probably right about this. But the why is that fans believe that a three-game series between two even-matched clubs (or a one-game play-in) is more meaningful than a coin flip. My point was that, regardless of what fans believe, the coin flip is just about as accurate a way of determining which club is actually better.
But of course, the expanded post-season isn't about determining which club is best - if it were, it would admit fewer clubs, and use longer head-to-head series. The choice has been made - to include additional markets in the post-season (more clubs), at the cost of rewarding mediocrity, because a mediocre club can just get lucky in a short series (or a series of short series!). It's all about the marketing.
Personally, I would prefer a post-season that rewards seasonal excellence with more than a bye in a crapshoot post-season tournament.
This won't happen, but...
Decide how many clubs belong in the post-season. My personal preference is...25% of them? That would be eight, in a 32-team environment. That could be eight division-winners (Four-team divisions), or first- and second-place teams in four eight-team divisions. But you have to win or place to get into the post-season.
Play longer series - three tiers of seven-game series. 4x7, 2x7, 7. Total possible games in the post-season = 49. (In the current post-season, you have 4x3, 4x5, 2x7, 7, or total possible games = 53.) 2-3-2 series. I know TV won't like it, but play in the afternoon as much as possible - the weather matters!
Given my preference for four 8-team divisions (yeah, I know; won't happen; God forbid): 12 games against 7 in-division opponents (84 games); 6 games against 8 teams in other division (same league) (48 games); 3 games against 8 teams in one division from other league (24 games); total 156 games. Break ties using a) head-to-head records; b) run differential; c) whatever.
Yeah, won't happen. I know that. Four-team divisions. Wild cards. 3-game post-season series. But no coin-flips.
I'm old. Time was, you didn't talk about building a team for the post-season - you built a team for the regular season, because if you didn't, you weren't in the post-season. Now? Build a team that's just good enough to nail down a post-season slot (12th-best of 28? Good enough!), but top-heavy with pitching, so likely to prevail in a do-or-die short series.
Time was, the season mattered. You had to perform, to get there. (the post-season). Now...unless your team is bad, you're going to get there; the season doesn't matter that much, the focus is on the tournament. And...given that the tournament is a crapshoot, mediocrity is probably good enough.
Makes sense, I guess, that MLB simultaneously wants to downsize the draft, downsize the minors, rely on colleges that wreck pitchers' arms, etc., to save money. It no longer really matters if there's less talent developed, if teams are mediocre - because mediocrity will get you into the post-season.