I hear on occasion folks decrying a "long layoff" between playing games. I don't know to what extent that is true, maybe some, getting rusty etc. You contrast that with injury possibilities and simple wear and tear. I lean to thinking a "tune up" game after a month off could be net useful for most teams. We'll hear this excuse I bet when a % beats a 4.
The NFL has their preseason for some reason, I surmise they view it as a net benefit, it's not exactly the same thing.