You're missing the point of simulation.
At it's base, a simulation, in order to actually BE a simulation, must tell the person simulating something, information about whatever is being simulated. Urg, that's a horrible sentence.
My point is, if you have a simulation about how a yo-yo works, that simulation must actually answer basic questions about how a yo-yo spins and is able to go up and down the string. If the simulation is a black box that only tells you that you start with the yo-yo in your hand and then finish with the yo-yo in your hand, that's not a terribly useful simulation. It's not really a simulation at all.
So, let's apply that to D&D. You attack an enemy with a sword. The enemy has a shield and is wearing chain armor and has a Dex bonus of +2. You roll an attack and miss the target by 1. What happened? For D&D to actually be a simulation, it has to tell you what happened. But, it doesn't. All it tells you is that your attack failed. You have no idea why it failed. Did you bang off the shield? Was it dodged? Was it parried? Did you whiff entirely? Did you actually make an attack or just a feint?
You have absolutely no idea. And D&D is full of this sort of thing. At no point does D&D actually tell you anything about how something works. You know that you succeeded or you failed and that's it. The idea that D&D is some sort of simulation game is ludicrous. It's this pernicious meme that has been repeated for years without anything to actually back it up. Even going back to the whole sandbox "living world" stuff, none of it is actually based on the mechanics of D&D. Those Living World supplements are pretty much system neutral. You could use them in any system and they would still work.
If you could take every Forgotten Realms supplement and run it in FATE without actually changing anything, how in the world is D&D simulating anything? See, if you actually have simulation systems, they don't work in other systems. You can't take a Harn supplement and run it in another system without massively reworking it. Because HARN is a heavily simulationist game that ACTUALLY tries to simulate something.
D&D, at no point in its history, has ever claimed any simulationist leanings. That is something that, for some unfathomable reason, people have added. Well, actually, the reason is pretty clear. The only reason that people try to claim D&D as simulationist is to block any and all changes to the mechanics that they personally don't happen to like. It's pretty much the beating heart of conservatism in D&D. It has nothing whatsoever with actually trying to simulate anything and everything with trying to force others to only play one kind of game. It's the ultimate in onetruewayism and has been used as the blunt weapon to force the fandom to reject changes that people happen not to like.