Board Thread:Support Requests - Getting Technical/@comment-3219540-20150428230653/@comment-452-20150429004724

Well, you really only need the templates you use.

You should definitely check out Special:SpecialPages, especially Special:Unusedtemplates. I'd have a look through the templates that aren't being used, and figure out whether you think you'll ever use them, and delete them. If you ever do need them in future, you can always undelete the template page, or copy it from another wiki.