That’s not how that works. You’re assuming the people behind MBFC are operating on an objective scale, even if you don’t like it. But they clearly are not. This isn’t a case of everything being shifted to the right. They don’t abide by their own rubric. So there’s nothing left but whatever they subjectively rate.
A single arbiter of truth and fact is only good as long as it’s actually an objective source. Which has been thoroughly disproven.
If you cannot understand why it’s dangerous to rely on an unreliable arbitrator of fact and bias then I can’t help you.