Board Thread:Support Requests - Getting Technical/@comment-9605025-20160507213658/@comment-24473195-20160512200952

Yes,  incemplates ( extreme template inception)  are discouraged both by developers and the mediawiki software (see Template limits) because it slows things down (see Help:ParserSpeed. There is a limit to how far "down" you can go before the software blocks you.

You can only get information either from the parent template, the target page or both using lua. However, the approach you are attempting seems strange, and I doubt it will work efficiently. I understand that you're trying to reduce the duplication of content, but this is certainly a very bad way of doing it.