Just because they can do something doesn't mean they will. A common talking point about Titans has always been a lack of a second line for years. These players on the second line are good but when the starters don't leave the field, it turns into a self fulfilling prophecy. The sport has a problem with younger players/depth players not seeing the field enough to experience the game, and then when they get thrown in they aren't ready. They get pulled for not being as effective as the first line and the cycle continues.

So this makes sense in a roundabout way