I don't like this. I get the idea of keeping your players healthy going into the season, but Prescott is playing with literally an entirely new receiving corps, including the TE position. Live reps against an unfamiliar defense are necessary to build timing and determine progress in terms of the connections between QB and WR. It also sends a message, albeit indirectly, to the team that it's OK to gear down and shut it down if there's an injury, or the fear of one. You can't keep putting guys in bubble wrap - they need the reps and conditioning that comes with playing.