Documenting what you have been told verbally is not a negative act. People forget what they have said all the time!
Generating a followup email is stating your understanding and interpretation of a verbal conversation. Verbal communication is full of intricacies. Especially when communicating things like priorities.
Why did you spend so much time on that feature and not this one I think is more important?
Why did't you tell me that "minor" feature A was going to mean that this more important feature B IMO was not going to get done in time?
Generating a followup email is stating your understanding and interpretation of a verbal conversation. Verbal communication is full of intricacies. Especially when communicating things like priorities.
Why did you spend so much time on that feature and not this one I think is more important?
Why did't you tell me that "minor" feature A was going to mean that this more important feature B IMO was not going to get done in time?