I don't agree with this. Posts can be edited due to good reasons.
Sometimes, I edit my posts to correct typos orgrammatical errors. Sometimes, I edit my posts to add some information that were not available when I created the post.

What Saint-loup is doing is completely different. He posts a few words just to have a reserved post and edit it to make the post longer after days. That's probably done to spread the posts throughout the week and not be accused of burst-posting.