Tx of GSW's is based on anatomic region.
The tampon thing is off key...Pressure is the way to go on most.
As for the 3-sided tape thing (chest inj)...That is difficult sometimes, at best. Often cited to avoid the victim developing a tension pneumothorax.
In an urban setting (where EMS is usually minutes away), sealing a chest wound is probably easier, and the victim is going to get a chest tube anyway
Don't forget the neck...Neck wounds must be sealed.
Just .02 from an old operator