GFM spec and accessibility

Any reason gfm spec. for task lists is not to create a label for the input field? This doesn’t adhere to accessibility standards. I am trying to use marked to render a readme and am being penalized on performance scores because task lists don’t render labels. Marked is reluctant to implement them as they are following gfm spec. Link to the issue: https://github.com/markedjs/marked/issues/1486