Syntax highlighting is wrong for WITH statement in Wikidata Query Service. The entire WITH part of a SELECT statement gets underlined with a red dotted line even though the query works with BlazeGraph, see, e.g., http://tinyurl.com/y9ekltr7
No, it does not make sense to duplicate every single upstream request in downstream in order to make downstream backlogs larger and less maintainable.
If you would like to report this to upstream, please go ahead. (However I also do wonder where "upstream" is in this case - maybe Jonas could clarify?)