I prefer to remove this code than leaving it there when it does not
work. The removal reason and the actual problem are better documented in
the Known Issues section of the README so other developers get it easier
to work on it.
Responsive is a hard thing in mails, because mail clients usually render very badly everything.
This new module adds a good collection of snippets in a pseudoresponsive manner, that will seem responsive in most cases, although they are not, technically.
Inspired by https://css-tricks.com/ideas-behind-responsive-emails/.