We have already user profiles, project pages and event pages, but Tasks are new. They are a new entity and we need to figure out the best way to handle them. The natural tasks generators are Bugzilla and Gerrit. We need to find ways to plug them.
Topic on Project talk:New contributors/Roadmap
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This might be of interest in this context: Mentorship programs/Possible projects#Improve the mediawiki-bugzilla extension to a deployable level, especially if we plan to link bugzilla and gerrit.
fwiw Andre and me used Extension:Bugzilla Reports in previous projects. It did the basic work. I guess Mozilla had a good reason to start another one instead of picking up and improving that one?
Perhaps they just didn't know about it. You'd need to ask them :)