Sometimes an idea sounds good on paper/when it's being pitched and just falls flat in practice. Ever since the infamous show-ending Dark Order angle that everyone hated, it's been stated that Tony not only made sure he had final say but that not everyone's idea is going to get an automatic green light. Some things just don't work when you try them, which is fine. They've been good at recognizing when things don't work and move past them quickly. I think telling talent that we can try things but if it goes over like a fart in church we're not going to keep plugging away at it seems like the better way to run things and still allow people to have input.