That quote is...really something. RTD has a habit of overexplaining things to the point of incomprehensibility, but that takes it to a new level.
I do think the basics of what he's getting at ring true - they certainly struggled a bit with "how much sexism should the Thirteenth Doctor encounter," and "how much racism should the Fifteenth Doctor encounter?" They both probably should have encountered more than they did, but if the story isn't about that, you run the risk of derailing the entire story. But if you include it "casually," as just a fact of the world, as they did in this case...that's not necessarily better. But maybe it's still worthwhile?
I don't think there's a right answer, but RTD sure managed to find a wrong one.
On this topic, I was certainly laughing right along with the show's depiction of Mickey-as-a-murder-suspect, but that has unsettling racial implications on its own, if you really interrogate the idea.
It's funny, I was just about to say the narratives of the season seem to be taking shape, but you're right - there are still some things up in the air.
I wouldn't be mad about that at all. But I do hope BC can get things more together - I like Buck Pierce.
I'd also like to see the defending champs gather some more steam.