Hiding your login links can stop hackers.

For example if you own a website and are on the dashboard backend of the website and expose your link; a hacker can use that link to try logging into your account to take over your website. Same can be done other places too but might be less worrysome depending on who you are. For example your facebook profile link can be used to help a hacker find your account and then from there they could try exploiting their way in or phishing you even if Brute Force is untryable. A really skilled hacker might even be able to use exploits to hack any link they want so make sure to hide your links! Especially if you think someone skilled might come after you for whatever stupid reason that they do it to other people.