I think if Michael had clearly gotten away, it would have seemed a bit too focused on setting up a sequel versus the mild ambiguity the final film leaves you with.
Personally, I like the triumphant ending to the final film.
We already get that callback with Laurie in the new film, so the reference is still there, but the ending is new and different.
Parts of the original ending feel a little bit too close to John Carpenter’s 1978 film, especially with the same ending of Michael Myers getting up after being pushed out a window.