Roleplaying doesn't mean "I can use all the weapons in the game and expect exactly the same result every time", quite the contrary, actually.
Having to choose your weapon depending on the situation IS roleplaying.
Yeah, mods are never downloaded my the majority of players who bought a game, ever, especially a recent one and without the steam workshop.
That's pretty much a given, and I would add that many people who bought the game don't even play it.