These are the known limitations of the Journal Plugin. If you find any others, please respond here.
Conflicts with other plugins
Layouts can be installed, but if there is a sidebar applied to journal topics it will break the Journal topic styles. I’ll address this when I can.
Question Answer Plugin
QA can’t be installed on the same instance. It’ll break the frontend mechanics of this plugin. I’ll address this when I can.
Features of normal topics that are missing
Timeline is disabled entirely (this post ordering doesn’t work with the timeline mechanics).
Potential style issues
Journal style changes, particularly comment indentation, will not work in all themes out of the box. The spacing in Discourse topics is delicate. It’ll take time to get that right so that it works well out of the box across different themes.