PITTSBURGH — You know by now that preseason NFL games don’t count for anything. It’s a way for coaches to collect game-speed tape on players to make roster decisions that probably could have been made on the first day of camp. So when you watch a preseason game, you mostly look for execution of basics. That’s where the Steelers have been a little scary. Protection hasn’t been there for the quarterbacks. Ben Roethlisberger is good at evading the rush, and he’s good at making plays on the run. He shouldn’t have to do it on every play, though. How the Steelers allowed their line to get this way is a major mystery. They’ve gotten little help from the draft, and they were seemingly ill-prepared for Alan Faneca’s departure, which was inevitable. They should have seen it coming two years before it happened. So now they’re overpaying Max Starks to be a backup and facing three possible free agent scenarios involving the offensive line this offseason.