I think it would be useful if links to other Stack Overflow (and possibly Exchange network) questions and answers automatically had anchor text added to them, if the user doesn't add any themselves, in both posts and comments.
To illustrate, here is a link that a user posted as a comment:
Wouldn't it be better, both for user experience as well as SEO, if the anchor text for that link was automatically set to this?:
For posts, another benefit would be that there would be less need to revise them to add anchor text to links that have no anchor text.