I don't think CSS modules are the issue to making it responsive. We just decided to focus the design/engineering resources on making mobile apps instead of responsive web app.
Ideally we would do both though, and hopefully we can in the future.
i agree that CSS modules aren't the issue but it def makes it easier to be responsive when you use a CSS framework. i think it would've been nice to be responsive from the start. relatively less resource intensive if written using bootstrap and maximizes customer value by making it easier for users to browse it on mobile without installing an app.