Yes, it certainly has "a universal meaningn". but it's not quite as simple as what is "widely accepted".
And I freely admit being an elitist up to a certain degree (and that degree is important), no use denying it. I think everyone around who's been here as long as I and have read my posts would agree on that.
I don't agree that "anyone" would be familiar with a gun, let alone be adept at using one. People still live normal lives there, it's not a full on combat zone where everyone has military training. And being able to have V be inept with guns (at the start, at the very least), would be much more interesting concept gameplaywise (and would've been storywise too) than having him/her be... well, if not a grizzled combat veteran at his you age, a "well acquainted" gunslinger at least as it seems to be - let alone that all character progression revolves around combat one way or another.
Then you must also accept that yes, we can ascertain what it means when someone says that its "a pretty hard core rpg". You might personally have higher elitist standards, but that doesnt mean the term is vague, it just means you arent sure if it will live up to your belief of what a "hard core rpg" should be. So i think we can get a pretty good generel idea of at minimum, how in-depth it will be, when someone uses such a self explanatory term as "hardcore rpg"
"I don't agree that "anyone" would be familiar with a gun, let alone be adept at using one."
Wel, I didnt say adept, but you are just wrong. This is NC. Its america and their second amendment hard on cranked up to 11 in a city with the highest crime rate in the world. So not only would pretty much every know how to/be familiar with holding a weapon V would espcially be, since the life paths are "ruthless corpo", "street kid" and "nomad". All of these would have at least some degree of knowledge to hold a gun.
Now remember, the game starts with the gun hadnling "feeling pretty bad" so when im saying people "have some knowledge/experiance" how to hold a gun that isnt implying any level of "expertise" Just that they wouldnt pick up a gun and go "wtf is this I have no idea whats happening"
And finally, it wouldnt be fun. You can talk about how it would be "an intereseting concept gameplay wise" but having to feel "downright awful" everytime you use a gun (until a certain point) isnt good gameplay, not only would it turn people off not familiar with how the upgrade system works, most players who do would also not enjoy it.