Because there's literally 0 way to do a 100% perfected narrative of Elden Ring. The story doesn't work that way.
Will the movie suck? Maybe, but I'm not looking for a 1 for 1 copy, because it's literally impossible. If it does suck, who cares? It isn't going to "tarnish"(see what I did there?)my love of the video game. But maybe we wait for the fucking thing to come out and be consumed before we start boomering too hard, eh?
Are you somebody who can't compartmentalize and separate the mediums? It can still be my favorite game of all-time and have a movie adaptation, even if it sucks. Can you not look at it in a similar vein as that of the Mad Max stories/movies?