And plus if the weapons reacted like they did in real life, there would be certain weapons that would always be the best choice to have, rather than each one having strengths and weaknesses.
But if the strenghts and weaknesses that are implemented for "game balance" are contrived, do they serve a logical purpose other than filling any empty "spot" in the weapon hierarchy? If the weapon is modeled like the real life one, and it plays like crap, then maybe they could just find a better weapon to fit the need rather than ask us to suspend disbelief? It's a game, and I'm willing to suspend a lot of dis belief, especially for the story and setting, but if real world item are placed in the game, my disbelief need booster jets to be suspended sometimes.
No one has ever got it right, in any game to date. For example, what game have you seen where you're temporarily [or even permanently] deaf and your ears are ringing after you discharge a firearm [without plugs in or muffs on]?
I've shot a ton of weapons up to and including 81mm mortars without proper ear protection. And I've never had a problem. I said, I've never had a problem. What?
Asparagus? What did you say?
How would that have been developed yet? Look at the timeframe and such, and think of how the world and universe of Fallout is. Itsan alternate reality, so you can't put in some of these weapon systems.
I might remember some Popular Mechanics or Popular Science issues from the '50s that showed the then idea of what fleets of pilotless planes and rockets would look like. There had already been remotely operated and guided planes and rockets by the end of WWII. As long as the "unmanned flying vehicle" was made in that vision, I really wouldn't have much of a problem with it.
Although he actually did
mention the BFR at some point, sooo...hmmm. Okay, I'll stick with the BFR and call it "wishful thinking." And hope it's the 10" version, like mine.

On a technicalilty, ReinBach gets the 1886. He called it first, I think. Anyways, the BFR is way cooler and I still have massive gun envy. You're my new role model.
Those are my thoughts on this question. I want the weaponry to fit in the game. It doesn't have to fire the right round or sound perfect, it just has to fit. Now, accuracy regarding the weapon would be icing on the proverbial bullet filled cake.
I guess my position is the closest to yours, Kiebler. First and foremost, it must fit the setting and story. Secondly, make them as realistic as gameplay and technological/time constraints can make them.
First of all:
I think they HAVE to implement WWII weapons. The game's lore simply demands it! There were a lot of thompsons, BARs, MP44, Garant and Mauser rifles,... around!
They don't
HAVE to. What if instead of many of those weapons you mention, rather than going into surplus storage, 3rd world use or hitting the surplus sales market, all those guns were subject to arms reductions that occured in the alternate timeline and not ours. A whole bunch of the weapons that did go into longterm storage did end up getting destroyed. The ones that hit the surplus market at some point are the ones that survived. It's also over 300 years since all those weapons were in general issue. Finding some of them in working order is not only believable, but inevitable, but finding tons of them laying all over the place would be like everyone on your block today owning a flintlock rifle. Don't get me wrong. I really wanna shoot a raider's head off with an 1895 Winchsester-Lee Navy. I'm just saying that rational logic sides more on a lower prevalence of these weapons than on a higher prevalence.