You can log in to their forum with Discord, Github, Google, Reddit, Stack Exchange or Twitter accounts. It would be better for them to support logging in with any OpenID provider using OpenID Connect, but they do support some of the major ones at least (except for Facebook and Apple).
According to the footer they’re running MyBB so although it is more centralised, I wouldn’t call it proprietary.
What advantages would Lemmy have over the traditional style of forum for their use case?
Yeah it’s not the end of the world. It’s slightly disappointing that you have to create yet another account unnecessarily.
You can log in to their forum with Discord, Github, Google, Reddit, Stack Exchange or Twitter accounts. It would be better for them to support logging in with any OpenID provider using OpenID Connect, but they do support some of the major ones at least (except for Facebook and Apple).