As has already been mentioned in the comments on the post earlier today, emailing a direct login link or merely a password reset link actually do have different security implications: when an attacker gains access to the account by resetting your password, you will know about this as soon as you try to login yourself. With a direct login link you won't.

Furthermore, when offering direct login links you are training your users to not remember their passwords. A bad side-effect, unless you have only users who will never login except when notified.