[oldmanwinters]

Originally Posted by Leo656

Article also calls Birds Of Prey "a faithful adaptation."
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According to our sources ... the Turtles producers were originally keen to go for an R-rating for the reboot. However, the box office problems of Birds of Prey are apparently reducing their enthusiasm for straying too far from a broad audience, while still going for a faithful adaptation. That being said, they’re still going to be keeping things on the more mature side.

I read that not necessarily in reference to Birds of Prey being a "faithful adaptation," but that the TMNT producers want to be a faithful "mature" adaptation... even if they get skittish on an R-rating (being one of the excuses people cite for the failure of BoP).