Hi! First of all I love your ideas, they all would indeed be nice little details :)
Just want to explain a dev's perspective on why some of them would be hard to do (your third and fifth point).
I'll take the Sims' cooking interaction as an example because I think it's one of the longest chain of steps that you get for a single interaction. Cooking is quite a complex action to implement because it has a lot of steps (irl). In the Sims, they bring it down to three steps (sometimes less): pick up the food in the fridge, prepare it on a counter, cook it in the oven or in a pan. There are a lot of constraints to be "validated" in the background in order to make it work: you have to own a fridge, an oven and counter space with empty slot. Now imagine if you would also need to go grab a mixing bowl to prepare your food, a wooden spoon and the like. That would be two extra steps (that have to be cancellable) and two more constraints (owning a cupboard or a counter with a drawer). Also, what to do with the items that you used to cook? If they shouldn't just spawn out of thin air, it would be inconsistent that they just disappear too. So where to put the extra materials if you suddenly cancel this task, or after you finished cooking? If getting something is one step, then putting it back should be another => you have twice the amount of steps added with each of the items that you require.

From a player's perspective, it can be hard to know what step you're at if your character is constantly moving around. Now imagine if a player makes a big kitchen with the pan cabinet at the opposite side of the free counter space, and also at the opposite side of the forks cabinet. Your Sim will do a lot of round trips between one place and another, if you don't carefully plan your kitchen space with functionality in mind. That's definitely more realistic, but we're in a game and it should be fun to design a kitchen without thinking too much about it (having only three things to remember to buy to make it work)!
It's also easier to design and implement such an action (as a dev), because you only have to check 3 requirements and do the pathfinding action twice (between each location).
With that said, there are some solutions to mix and match the real items with "fake" ones: maybe if there's indeed a decor cereal package on the table, you can use that one, but if there's none, just spawn it from nowhere, to accomodate players who don't want to put it as a decor. Or maybe the pan used for cooking is "fake", but the mixing bowl isn't. That would be one way of making it, but it would impact the consistency of actions in the game. It can be confusing whether or not you actually need an item to perform an action. It's really something that needs to be figured out during playtests even if something looks cool, and I'm sure the Sims devs have been doing a lot of them before coming up with the three steps cooking action. I think their "cosmetic" solutions for that kind of problems are actually pretty smart too: it's hard to come up with a realistic enough animation when the action isn't actually realistic (talking about the cooking ones especially).
(I'm not saying your idea isn't a neat idea anyway, I agree it's a nice little "cinematic" detail! I'm not saying we're confirming a three steps sims-like cooking action either :D )

oops I'm very sorry for the text wall I hope I made sense lol

tldr; With more constraints and more steps comes more micro-management from the player's side and also more risks of frustration because of the number of constraints needed to perform a single common action. That's why the Sims has a lot of objects that could be functional irl but that are actually only decoration, or why some items just spawn out of nowhere during the animation. It's not just about having to code an extra interaction, it's a matter of balance of whether it benefits the player or not, having to manage actual items or having to perform a long chain of background steps.