Recycling old content and a lack of creativity in development

I don't mind recycling at all if it is better than done before if I am getting favourite things back but sometimes it does feel that stuff is left unfinished or with bugs. Is this because developers are keeping in mind future expansions and other packs that add to the action - or is it that there is not much co-operation between the pack teams?

The game definitely runs better for me now 32bit is being abandoned though. My laptop is not getting so warm.