Well, you said the conversations are also mature therefore the visual reduction in gore will not fulfill a purpose, and they should move onto another game...............
Well as I said if it's just "turn off blood and nudity" then it's easy and I definitely have nothing against such a thing. I just wanted to tell OP that it's probably will not solve their problem.
I've actually started to play violent games since I was 10, I think. So I see no problem in teenagers playing such games but it's up to parents what to allow their children. I just don't want censorship to go beyond toggle off blood/nudity.
Oh yeah, if this is about censorship or kid gloves or child-proofing the game then there is no question - this is a mature game with explicit content. Full stop. The main question is: are there certain things that are low effort, high impact, that could lower the age floor for being able to passively consume, if not play, it? The history of games has shown it to be possible, effective, not barring them from being blockbuster successes, and something that has demand. The feasibility of it will be contingent on things like them making design decisions to have storyline dialog and responses done whilst in [explicit situation]. Or, if they hear feedback early, do they decide to separate the two - making it so the disabling of one doesn't disable the other and allows them granular control of two things they are offering: 1. Sex & Violence 2. Story. If they divorce the two it gives them more control, anyway, and might allow them the benefit of extending a different experience than the one they have chosen to offer as their preferred curated experience.