Cherrypicking? No team wants to just win a WC spot now. It's all about winning the division. DET'14 would not be in a playoff spot in previous years. There's a big difference between 3.82-4.02 ERA (somewhat below average) and 4.17 ERA (mediocre). TEX/BAL '12 were tied WC winners and had to do a one game playoff which is never preferable. Looking at MIL this year they are in a weak division and also exceeding their xW/L by 3 games. Maybe that was the Jays hope, that all 4 other teams would finish at or around .500?
It's not so much about giving up more than 4 runs a game as requiring at least average pitching to get into the playoffs. You can't have below average pitching and expect to make the playoffs.
I'd rank pitching generally as 1-5 = good, 6-10 average, 11-15 bad. How would the Jays look if they were even average (3.87 ERA) at pitching? 0.30 less ERA over a season is about 48.6 runs, or 5 wins. At the least they would still be in the running. Maybe even that wouldn't be enough, but it does go with generally having to have good pitching to make it.
1992 Jays had 3.91 ERA good for only 9th. Pythag was only 91-71, they actually got very lucky. (MIL '92 had xW/L of 96-66)
1993 Jays had 4.21 ERA good for 5th. Pythag again was only 91-71, but they were the strongest team in their division.