Inside Out 2 has a single writer, who also worked on the first.

Consulting with SMEs, testing with audiences, etc isn’t “design by committee”.

Similarly, “Die With a Smile” seems to have been the work of two people with developed styles with support — again, not a committee:

> The collaboration was a result of Mars inviting Gaga to his studio where he had been working on new music. He presented the track in progress to her and the duo finished writing and recording the song the same day.

Apt seems to have started with a single person goofing around, then pitched as a collaboration and the expanded team entered at that point.