The short version
Unstructured feedback averages work toward the middle. Structured feedback sharpens it.
What is really going on
Multiple untriaged voices produce contradictory notes that force compromise rather than choice.
Feedback delivered as a solution removes the maker's ability to solve it better.
Late feedback is the most damaging kind because the cost of change is highest.
How to handle it
Route all notes through one named decision-maker who consolidates and resolves conflicts before sending.
Ask for problems, not prescriptions: 'the pacing loses me at four seconds' rather than 'speed it up'.
Timebox feedback windows per stage and close them explicitly.
The takeaway
Protect the idea by structuring the conversation around it, not by defending it harder.
