For example, how would the game be less enjoyable if weapons were carried realistically, or if there was a passage of time?
Good question!
(i say it bcs i would probably give it too, if i would be on your side of this baricade

oh wait ... i did, just other way around.

)
I shall take it in backwards order, since time is easy one.
Even tho ... it depends on what are you meaning by "passage of time" ...
- It can be interpreted as timed events ... you take the quest and since *now* you have *XY* days to deal with the problem.
Some people (and i say some people just bcs i dont want to name Icelyn again) allready expressed they disliking for this, and i kinda understand her ... i mean them ... since you can easily get lost in sidequests and exploring and forget about that there is only *XY* days to save the Grove.
If that happen to you, it certainly can be source of frustration ... specificly the grove can be quite harsh pusnishment, since you loose a LOT of quests, at least one (but up to 3) vendor, and other stuffs (like loot, lore, etc.).
Frustration allways sucks ... i hope we can agree on that.
Even tho, just for the record ... personaly i would welcome timed events, since i belong on the other side of spectrum ... i dont mind loose single quest, bcs i get to fulfill another, since i would replay this game several times anyway ... so this way i would at least have even more distinguished experience for each play.

- It can also be interpreted as regular time flow ...
The way we know from Elder Scrolls, or Fallout series ... time flow, and the world reacts ... during the day all works as usualy ... in the night, people are sleeping, shops are closed, city feels empty until you enter some house and if you do, you are usualy attacked on sight.

That kind of stuff ...
That sounds immersive as fuck and i believe that many people would welcome such thing.
Not myself tho.
While idea of night attack while people are sleeping and murdering everyone rather than battle them is tempting ...
I hated it in both Elder Scrolls, and Fallout games ... i come to town to trade, gain or finish my quests, there is not much other reasons for me to get there really ... and every single freaking time i fast traveled to the city ... i emerged there in the middle of the night, when of course none of it is possible. -_-
And the idea of need to spend valuable rest resources just to make this freaking city to work as a city ... seems horrible to me.
- It can also be interpreted as purely cosmetical time flow ...
Much less immersive than the one abowe ... on the other hand, much easier to enjoy im my personal opinion.

So thats my "how" for time passage ...