It's safe to assume that if a person hearts/likes a post that they care enough about the feature that they would like to be notified when there are future comments or any progress updates on a post.
Also, if they take the time to add their own feedback or a response to a post thread, they have more than "lurking" interest in the post, so allowing an auto-follow feature could automatically subscribe that user to be notified with updates about that post.
I'm a part of several other communitities that use this "auto-follow/subscribe" feature, and I've never unfollowed. I've always thought... oh... that's nice that it automatically will update me when there are updates to the post!
6 months ago