Thread:Sannse/@comment-43689784-20200229011047/@comment-1038387-20200229094125

They haven't stopped using Semantic Mediawiki. Applications for it are on hold, as it would upset the transition process.

As that blog says, it's a can of worms. I've heard it's actually closer to a ten gallon drum of worms. Unless you really need it, don't bother. You can use PreloadTemplates instead.