Hiding potential talent
This may not benefit the players, but it will benefit the team.
With no preseason games, players further down the depth chart aren’t going to be able to compile any film, meaning whatever team they currently call home is likely their best opportunity to make an NFL roster.
For the Giants, who are in desperate need of all the talent they can possibly compile, it means any young player who excels can potentially be horded and stashed away on their practice squad with anyone on the outside being none the wiser.
This is not entirely foolproof, but it does give the Giants a better opportunity to not only evaluate each player on their roster, but potentially stash away those they’d prefer not to lose.