You are right that movies are an artificial environment that attempts to simulate a fantasy world, and generate/encourage the "willing suspension of disbelief".
Many stereo recordings are also like this - some recordings (a small subset!) - actually endeavour to provide a "window" on a musical event...
These recordings are where the magic happens - where if the system is setup just right, and the recording is just right, you can close your eyes and you "are there" - the holy grail of high fidelity.
But reality is, most recordings are multi-miked, and then the soundstage is set up artificially, there is nothing there that has ever existed in reality. - For those, a Dolby Surround, PLII, or Logic7 rendition, is as authentic as anything else - and often will sound better, with a wider sweet spot, and an impression of imaging available right through the room (assuming multi speakers of course).
Even using 3 matched speakers, and Dolby PLII for a L/C/R setup, can provide an improved rendition of traditional stereo - Martin Logan and Bryston demonstrated that about 15 or 20 years ago... there was a brief buzz about it, and then it disappeared - but their setup was nothing "special" 3 well matched speakers well setup, and a Bryston AVP running Dolby PLII.
I enjoy most of my stereo material through my 5.1.4 setup, using Dolby Surround - when I want to "test" something specific, I drop back to pure stereo sometimes just to check stuff, but most of the time I prefer DSU.