Sometimes when you're scrolling down in the comments, someone says something that makes you want to check the link again for clarification. Then you have to scroll to the top and click the link, then close the browser and scroll back down to that comment again to continue.
To have a sticky Metalink on top when you scroll past the story header is a good idea. A simplified version of this could just be an icon to the top right corner of the Top Bar to visit the link.
Sometimes when you're scrolling down in the comments, someone says something that makes you want to check the link again for clarification. Then you have to scroll to the top and click the link, then close the browser and scroll back down to that comment again to continue.
To have a sticky Metalink on top when you scroll past the story header is a good idea. A simplified version of this could just be an icon to the top right corner of the Top Bar to visit the link.