Why is the Fablemans PG-13?

Why would a film like "The Fablemans," which seems to be a heartwarming tale of ambition and creativity, be rated PG-13? The rating typically suggests there are some elements of mature content, such as violence, sexual situations, or language that may not be suitable for younger audiences. Does "The Fablemans" contain any of these elements? Or could it be that the film's portrayal of the film industry and its struggles might be deemed too intense or complex for younger viewers? As someone who is interested in both film and its rating system, I'm curious to know what factors contributed to the decision to give "The Fablemans" a PG-13 rating.