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In fairness, most movies from other studios don't exactly go on to win awards either.
I would think it's to de-aging all the main actors (Pacino, De Niro, Pesci, Keitel), all of whom are at least in their 70s by now so it'll definitely be hard to pull it off convincingly. I remember when they did a Scarface videogame well over a decade ago where they had to get an impersonator to do Tony Montana's voice because Pacino himself sounded too old and hoarse, but then again this isn't exactly new (e.g. when Jimmy's introduced at the start of [i}Goodfellas[/i] he's supposed to be 28 but he's being played by a visibly 47-year-old De Niro).