Furnadan, the atmosphere you described as a counter to the EPI's 'superrealismshutup' - that being a troll-ish one - is usually not present in 'undisciplined' regiments. An example being my own regiment, during its 'golden age'. We'd talk and laugh and simply spend time with friends, but when the bullets started flying, we all knew what to do and whom to listen to.
And on another note; A large number of people prefer a more relaxed setting, because getting yelled at for speaking out of turn in a video game is just silly. We're here to have fun, not go to stupid lengths to make ourselves think we're Napoleonic era soldiers. If you want that, there are a great many Napoleonic and Civil War reenactment groups you can speak to. Though I must warn you that they won't likely yell at you, except perhaps during an event that requires it, because they've realised that it scares people away. (Who knew?!)
Spoiler
Also, it should be stated that, if you have to enforce 'PTS', then you've got a problem. A disciplined group knows when it's ok to speak, and when they need to be listening for orders; an undisciplined one has to be told.