This is what makes the four-game preseason a joke. I know that some teams have shared practices with other teams and host scrimmages. I think this would make more sense from strictly a player, scheme, play evaluation standpoint. If folks want to drive down to TC to see the Panthers line up with say, the Jags, for a scrimmage game, go for it.
Once you sell full price tickets, sell concessions, fill up a stadium, parking lots, etc, fans inevitably want to see a football game. I agree that winning is not the desired outcome for the coaches, but for those who remember the 1-15 season, that first preseason win the following August was a welcome sign.