It is true that you don't need gore, nudity, and harsh language to tell a mature story. It's true that when you go overboard with one or all of these elements, it can become comical. But it's also true that proper use of these elements can certainly help tell the story and set the tone.
The silliest moments in Sin City are when we have all these tough guys going to the roughest, rowdiest strip club in town and the main attraction dancer doesn't take off any of her clothes. I don't care if it is Jessica Alba, those guys are going down the street to the club where a solid seven is dancing with her top off. The netflix Daredevil series has a few instances where the characters really should be saying "f*ck" or "f*cking" and instead say "freak" or "freaking".
Moments like this feel really artificial and can take you out of the moment and hurt the tone of the work. Bioware should include whatever content they feel is appropriate for the tone and atmosphere they're trying to get across.