Pixar: the studio that kept betting on the harder idea
Pixar's reputation rests on a run of films that had no business being made. A rat who wants to cook. A silent robot for the first act. A retired superhero having a midlife crisis. The technology gets the credit, but the risk was in the premises.
The house rule
The studio's method was never a story formula, it was a question: what is the emotional idea, and does the plot serve it? Toy Story is about being replaced. Up is about outliving your plans. Inside Out is about learning that sadness has a job.
That is why the films survive the animation dating. The rendering in the early work is visibly of its time. The structure is not.
The hard ones
WALL·E spends its opening act with almost no dialogue and asks a family audience to read a performance built from lens movements and servo noise. Ratatouille ends on a critic's monologue about the nature of criticism. Coco builds its climax on a song about memory loss.
None of those are safe choices, and each one is the reason the film is remembered.
The sequels question
The studio's weaker stretch lines up with its most cautious decisions. Sequels arrived on a schedule rather than an idea, and the difference shows: the films are competent and rarely necessary. Toy Story 3 is the exception, because it had an ending worth building toward.
The pattern is not that sequels are bad. It is that Pixar is good when it starts from a question it has not answered yet.
What it changed
Before Pixar, animation for families was largely musical and largely fairy tale. After, the default became original premises with adult emotional structures, and every competing studio reorganised around that. The technical achievement made it possible. The willingness to open a children's film with a wordless montage about grief is what made it matter.