To my mind, the only reason not to leave the airport is not getting back. It's a short time you have and a traffic jam, or broken train, would complicate your journey. If worst came to worst, the carrier and your travel insurance provider would ask why you left te airport, thus causing you to miss the connection.
Of course, there is a very high likelihood that all will run smoothly. For myself? I'd chill out by booking into a paid-for lounge.