If manufacturers put automatic safeties on pumps and semi-autos, the safety would engage after every cycle of the action. Nobody would want to have to disengage the safety between every shot.
JMO keith, but no way can I believe that Jonathan Browning could not have designed an automatic safety that would cycle to "SAFE" when the last round was ejected. I believe that it just wasn't an important issue for him. No more important then than it is today.
I'm in the camp that feels the only true safety is between the ears, ingrained training to put the gun on safe when needed.
Best to you.