I don't think any version of D&D has ever really embraced "realism" as a design/play goal.
That said, I think your definition of "simulationist" is incorrect. (From what I know of it.) Simmulationist doesn't = realism. (It might be another goal of a game that is built with the simulationist mindset, but one does not have to include the other.)
Maybe not, but it had enough realism so I could buy into it. Even if the explanation was "It's magic" it's still better than trying to covince me that a warlord can heal someone mortally wounded with a pep talk. I can't buy into that, but I can buy into someone bing healed of a serious wound with divine magic.