Mailing list features

Are mailing lists passé or à la mode?

Just today, I got an email from hackingUI.com which says that mailing lists are resurgent.

There has quite literally been a newsletter revolution over the past few years. Email, while almost left for dead a few years ago, is back as one of, if not the best, ways to build and communicate with an audience.

There is clear tension between the Discourse position that mailing lists are outdated and the desire of many users and communities to continue to use email-only communication.

Are mailing lists resurgent? Is this relevant here?