This is a perfect “heads I win, tails you lose” argument.
Tails you lose: When a team trades a superstar reliever, “the expectation is to get good players in return.” Therefore, it is literally impossible for any return from such a trade to be worthy of praise, in the sense of exceeding (my definition of) “the expectation.”
Heads I win: Although I have failed to persuade anyone in this discussion that trading Hader was a proximate cause of missing the postseason (and several people have offered evidence for the opposite view), I cling to my opinion that it was; accordingly, the possibility that it was not must be ignored.