I can understand that point of view as well. It's not one that I share, but I get it. The team won something like 10 out of 12 games and they still moved Trouba to the 3rd pair. When the writing is on the wall, sometimes you don't need to actually suffer the L.
And again, for me it's not whether or not he's going to take a penalty that the hurricanes may or may not score on. This is now all about his deployment, or lack thereof.
The beauty of Rempe was his ability to take a (quasi) regular shift. The second he loses that, he's just another face punching goon that really doesn't have a role in today's game, especially in the playoffs against an opponent like Carolina.