I propose another explanation, why flip is flip: coaches work is to demand always more than has accomplished(at least in pro sport). And playing struggling startes to 40-s is maybe a message: wanna rest? then play well! bench doesn't have to clean away starters sh!t. Bench is there for helping, but starters have responsibility(so their work is to clean away bench's sh!t too).

But all this we are writing here is purely hypothetical, of course. None of us has seen "kitchen's side of coaching"