The problem with your argumentation in all of this The Old One is that you're treating any of these films as if they were written based on someone's initial vision of where the story should go. It is as if you think that retconning something interferes with some sort of sacred golden path. That is not the case. Every instalment has been patchwork. Aliens was exceptionally good in that overall palimpsest of a story. The overall story never achieved that height of brilliance since that moment, even with the instalment of 6 films.
Alien 3 does not reflect the original intent of the series any more than any of the other films. It is just somebody's interpretation of where things could go. It was a film made, ad hoc, so that the studio could cash in on the success of the previous film's success. It wasn't about respecting some grand design. They just wanted to throw some more violence on the screen and close up the circle.
Likely, the studio figured that there weren't enough sophisticated people interested in the series, and they were happy to put out a simple, relatively inexpensive slasher film to cash in. That's plebeian right there for you.
Retconning would actually show a level of care about the brilliant continuity that went before it. It will bring in the masses to the theatre, granted, but it would also appeal to an audience that has a more discerning taste and sensibility. ...always assuming that the film is good. Nobody can judge that because none of us actually knows the story... presumably.
