Atlassian is experimenting with ProseMirror for their wiki—I think the configurable schema feature goes a long way towards solving this. (Coincidentally, Adrian

Atlassian is experimenting with ProseMirror for their wiki—I think the configurable schema feature goes a long way towards solving this. (Coincidentally, Adrian, who is a contributor to ProseMirror, was one of the people who worked on WikiMedia's editor effort.)