Which situation should cause a writer edit his or her work?

Michael doesn’t like the dialogue in his short story and wants to make the character sound more realistic.

Gabriel realizes his entire conclusion is weak and causes his reader confusion, so he wants to delete it and start over.

Emily feels that she has made some poor word choices in her essay and wants to replace them with stronger options.

Nova thinks the details in her essay aren’t strong enough and wants to add a section strengthening her argument.