Also I think this should prepare Marvel fans on what type of Daredevil they will be getting. I doubt Disney goes the extremely dark route
I disagree. Deadpool 3 will be in the MCU and it's rated R. They are adding more parental controls and the Marvelflix shows to D+, so I fully expect them to continue that.
I think if anything Moon Knight will cross over into darker shows/movies in the future like DD and Blade and be rated R/MA when in the right setting, but right now they aren't ready and they likely wrote/planned this before those plans came into place.