Why does it matter to you who exactly implemented the features as long as if they get into Lightroom?
Yes, Hans spelled it out quite clearly.
If the bulk of new features and improvements actually come from the ACR Team ... exactly what did the Lightroom Team bring to the party for Lr 6? It's an honest question. As you can see from the responses, Hans (and myself) are not the only Lightroom users who have considered this question.
While we can see that Facial Recognition was added to Library, the return of multiple audio tracks (which has taken four full version cycles to get back) and a rudimentary pan and zoom feature in the Slideshow module and finally an update in the Web module (which basically hasn't seen much attention since v1) to replace the antiquated and obsolete Flash galleries. In the time it took to get these simple additions to modules that have been included in Lr since Day One ... Adobe had time to develop and add Maps, Books allowing multiple original modules to languish for several version cycles before addressing the finer details ...
This is the third full version cycle for Lightroom and we still can't do something so simple as create custom page sizes, margins and bleeds. Yet Adobe expects us all to pay them for such incredible progress and advancements.
For me, while I am not ungrateful for what has been offered. Collectively, if you look at the modules other than Develop ... what have been the goals and actual accomplishments of the Lr team itself? I'm not blaming the individual engineers that crunch the code ... but the management and accounting "teams" that dictate what the engineers are assigned to work on. Sometimes it seems as though they utilize a dartboard and a blindfold to establish their goals for module development and refinement.
As long as Adobe includes these other modules, I would like to see them offer the same level of enthusiasm and attention to detail in ALL the modules, not just the favorites. If Lightroom is to be a true
workflow solution ... it would be nice if they would actually complete a current project before adding new features.