safety standards

Is there some reason generic recreational scuba diving has standardized on a valve-up position for air cylinders, with hoses sticking out all over the place on the 1st stage? It's just easiest to do things that way? Valve up seems to be a lousy way to do things if you are at risk of snagging...

Due to the occasional apparent confusion about which way to turn tank air valves to open them, and the possibility of air being turned off by inept dive boat crew, etc, why isn't there some universal labeling standard to show which way to turn a valve on? It would seem relatively simple to have...

Does SSI have diving safety standards by which affiliated dive centre must adhere to? If so, are they published for public consumption? Thank you GJS