Was this in a game?
I don't know what the answer is because you've gotta get reps and injuries can happen any time but there's not much positive light on the preseason games and seems like I only make sure players just don't get injured.
Maybe teams practicing together to get looks but not totally 'live' is the way to go.
The Packers basically don't play any of their starters at all in the preseason. It keeps them healthy, but will they be prepared for the first few games of the season? That will be the question.