I think I can see what you mean. A few weeks ago I looked into a CBR-CNS award, and many of the options included at least one QF/JQ codeshare segment (no thanks!). But now the same search yields only true QF flights, regardless of date. It's only a loss if you need to book an award in the next few days or at any other time when true QF availability is scarce, but, in those instances, it can be useful to have the JQ/QF codeshare option.