That's not a completely inaccurate description of a lot of studio animation - theatrical or otherwise. I think part of why so many of Pixar's film work as well as they do is because it really does seem like the director is the person ultimately responsible for what ends up on screen. He or she may pull ideas from a lot of different people, but the movie is still the director's vision and he or she has the final say for what goes into the film and what doesn't. (This is the impression I get from what I've read and seen about Pixar anyway.) As a result, Pixar has put out some of the best and most personal films I've ever seen come out of a commercial animation studio.
BUT.....
I don't agree with the idea that compromises, concessions, and limitations are always a bad thing. Yes, it's lame when something is added to a movie solely because someone not involved with the making of the film demanded it or the management wanted a scene that would play well in 3D or the ending of the film wasn't testing well with soccer moms or what have you. But it can be dangerous to treat "the artist's vision" as this sacred thing that no one should ever have the right to change or criticize. I don't think there is anything in the Star Wars prequels that isn't what George Lucas wanted to be there, yet I can't say that they're good movies. Or, a little closer to home, look at The Thief and the Cobbler. Richard Williams did not want to compromise on that film at all. One of my college professor was an animator on it and she told me she was averaging about two or three drawings per day and that was considered fine. In the end, the film was taken away from him, reworked into something other than what he had envisioned, and given a brief theatrical release in which it pretty much bombed. I have seen the "Recobbled Cut" and while I think it's a stunningly beautiful film, it is not without flaws, chiefly in the story. When I think about that movie, I remember the amazing animation, but I don't feel any attachment to the characters or plot. It's still debatable whether Williams made the right calls or not and whether he really cared about making a film with a compelling story or was chiefly concerned with the visuals. But I can't help but feel that making some concessions to schedule and budget would have given Williams a movie that was at least closer to his vision than what ended up showing in theaters.
Any film is going to have some kind of limitations. Even if you decide to make and finance the entire thing yourself, you're still going to be limited by your own resources, your own schedule, your own abilities, and your own need to eat. What limitations can do is force artists to try ideas that they might not if they were presented with unlimited time, resources, and freedom to tackle any subject matter. "How do I portray violence without any blood?" "How do I make these toys into a compelling world and narrative?" "How do I make this concept as good as it can be on the budget and schedule that I have?" And an artist who thinks that listening to any kind of criticism is compromising his or her artistic vision may merely be ignoring his or her own weaknesses.
It's easy to romanticize, but the uncompromised vision of a single creator is not automatically going to be good while a studio-produced piece with "many parents" is not automatically bad.