I thought substandard construction was SOB's failure. Wood support structure undergoes a lot of stress with that much weight and force, and RCCA just didn't build enough support structure to keep the ride from shaking itself to death. I think structural steel, or more if they did have some, in key places would have made SOB a better ride.
As far as standup coasters, the issue with your head being farther away from the track is the biggest problem I have seen for a lot of people. When you're already standing up, going through the twisted maneuvers B&M put on some of their standup coasters just flings your body around much more than a sitting coaster. Just look at riders on a bus or train. When the vehicle makes a turn at higher speed or an abrupt stop or acceleration, standing riders' bodies jostle around more than sitting riders' bodies. B&M put some crazy quick transitions in Iron Wolf, Vortex CGA, and Mantis. Head banging from the quick transitions and shoulder harnesses that are in the perfect position to bash riders' temples and ears is the biggest complaint my friends an family have had with standup coasters. And of course the bicycle seat is not the best answer to stabilizing the body at midsection. Maybe if someone could re-engineer the seat area and find an efficient way to get Schwarzkopf style adjustable shoulder restraints that are comfortable and hug the shoulders without shifting down during the ride we might see another era of standup coasters.