There's also this (it's a great book even if you're not interested in screenwrting per se, its just a funny and accurate take on the "studio movie")
https://books.google.co.uk/books?id=ReWKqVUDmsQC&pg=PT79&lpg=PT79&dq=why+do+studio+movies+suck+donkey+balls&source=bl&ots=juZavrrdZg&sig=Z-BaioNxDQvZz1o2E4qm7VnjqLk&hl=en&sa=X&ved=0ahUKEwjI7MWt2PLXAhXHAsAKHfyQBK8Q6AEIMDAB#v=onepage&q=why%20do%20studio%20movies%20suck%20donkey%20balls&f=falseIt basically saying what we already know: Pretty much every studio movie ends up being done by committee (there are exceptions of course) so we'll never know how much of NB's concept stuff would make it into the final movie.
I'm reminded of the superhero / fighter pilot thing that was leaked the other day. I can't remember where I saw it now, but it was WB person saying how Green Lantern got made - essentially an exec was fixated on the idea of a superhero who was also a fighter pilot. He wanted Batman ret-conned to be a fighter pilot and someone pointed out that GL was actually a fighter pilot. And that's how it got made.
Basically, I think it's always going to be nip and tuck with the Alien franchise going forward as the returns (Prometheus aside) seem to be diminishing and that warrants more "eyes on" from the studio.
Taking risks doesn't seem to be working does it - I think Blade Runner 2049 was very much the director's vision. Brilliant movie that's under-performing apparently. I really hope it makes up its numbers, but is this going to be a trend towards the safe?