Maybe it can be used as an explanation as to why the Turtles didn't do much of it in the second film. After events of the first film and the time between, they came to realize that dad is somewhat like those guys on YouTube who think they know anything, what they were taught may not quite be as legit or the proper ways as they once believed, and Splinter relies on rat traits as an asset that they can't make use of anyhow.
