Forums. I don't know why the internet got tired of them, even when they sometimes fit the bill so well. Slack is chat. Mailing lists are far too outdated. Forums are good, and some good people out there are still developing them.

> Mailing lists are far too outdated. Forums are good, and some good people out there are still developing them.

WTF?

How is it even remotely sane to provide a user interface instead of an API/protocol?

I don't care to learn your forum's user interface, and I don't care to poll your forum for new content. I have a mail user agent that's configured to fit my needs and that I know well how to operate, and that's where all the mailing lists that I am subscribed to push their new content into this one unified interface for me to interact with them. Web forums for the most part are just a pile of broken usability.

Why not both? Something like DFeed[1] which is used as the D programming language's forum[2].

[1] https://github.com/CyberShadow/DFeed

[2] https://forum.dlang.org/