The reality is managers make good and poor decisions regularly. Sometimes they aren't exposed because of various factors and other times they are. If Mayza gets Santana out, the Jays win and post game, JS says they felt Santana could do more 'major' damage hitting left handed, but were OK giving up a run or 2 in that situation (given they were up 8-1) then people would have nodded and said - oh yeah, good call - what a smart guy this JS is.
But of course, the absolute worse f***ing outcome possible happened (which probably had what, a 5% chance of happening?) and now we're all here complaining that it was the stupidest decision ever made, even though Mayza probably gets Santana out (let alone he gives up a hit) in that situation, what, 75% of the time?
Here's another example - JS starts Espinal in Game 2. If Espinal goes 0-4 with that error, we should all be questioning why the f*** he started a slap dick hitter coming off the DL in an elimination game when he didn't get 1 rep at the major league level before returning. But of course Espinal goes 2-4 so absolutely nobody is questioning that move right now (nor giving him any credit for that ballsy move).
And god knows if the left Merrifield in LF and he didn't get to that fly ball down the line (that Tapia didn't get to either) then people are complaining he didn't put JBJ in the game for defense.
That's the world a manager lives in.