"The reality is, unless you can find specific calls that Yost made during the September slide that lead to losing games, there is no reason he deserves to lose his job."

Easy. Yost makes bad calls during every game that hurt his team. The most basic examples are letting Bill Hall start, letting Gagne pitch in close games, never putting better hitters in for Kendall when the game is on the line etc. etc. But if you want a more specific example, here's Joe Sheehan from Baseball prospectus:

"Yost elected to walk Howard to face Pat Burrell. This was... well, it strains my vocabulary to find the right word for it. Howard cannot hit left-handers, and would be a platoon player if performance mattered anywhere near as much as reputation does. Or if he had a competent manager. Howard is at .228/.313/.458 against lefties in his career, .212/.287/.410 this year. Howard. Can't. Hit. Lefties. Shouse, on the other hand, is in the major leagues for exactly one reason: lefties can't hit him, to the tune of .175/.192/.289 this year, and .211/.263/.325 for his career, which includes a bunch of years when he was barely a major leaguer. Manuel sending Howard up against Shouse was a continuation of a theme for the Phillies: not hitting for Howard when he has little chance of doing something good. He was giving Yost an out, and Yost gave it right back.

"That set up Shouse versus Pat Burrell, which cried out for a right-handed reliever. After all, Shouse is a pure specialist (.307/.390/.455 vs. RHB career; .293/.371/.446 this year). The only way walking Howard even might make sense is if Yost were to bring in a righty to try and get a double play out of Burrell. Burrell doesn't have the big platoon splits he showed earlier in his career—he's a dangerous hitter against both kinds of hurlers—but leaving Shouse in to face him was asking for trouble.

"Think about this for a second. Yost had a 481 OPS pitcher facing a 697 OPS hitter. He elected to issue an intentional walk in that situation to allow an 817 OPS pitcher to face a 905 OPS hitter with an additional runner on base. That's when you start looking around the roof of the stadium for snipers, because gunpoint is the only place where that kind of decision makes sense."

"The reality is, unless you can find specific calls that Yost made during the September slide that lead to losing games, there is no reason he deserves to lose his job."

The reality is you can't admit when you're wrong. See above.

I wasn't looking for any retraction or anything. I was just telling you that, time and time again, Ned Yost made objectively wrong decisions that cost his team runs and games. Baseball is largely a numbers game, and Ned went against the numbers in his personnel decisions, in his bullpen decisions and in his pinch-hitter decisions. He's the kind of guy that would double down on a hard 12 in Blackjack when the dealer is showing a 6.

What should he have done? In the above instance, he should have had Shouse pitch to Howard. Boom. It's that easy. It may not work, but the odds of it working are MUCH better.