I spent some time early this morning while my ears were fresh to try a few things. First let me explain that I planned on using the new DA profile feature to enable me to profile all of my amps direct and then have the ability to add an already good cabinet profile to them. This is not what this new DA feature was designed to do, but it should be able to do it. I compared 3 profiles I had of higher gain amps. I had the direct profiles saved so I was comparing 3 profiles with cabinets added and merged to three profiles with cabinets added and not merged. The merged profiled sounded fuller, better, but similar, the other three unmerged sounded more distinctive, but less full, weaker.
The bottom line for me seemed to be that merging a cabinet into a direct profile can give you some good sounds but with certain cabinets its going to make all of the profiles sound similar. I'm not sure if that is what the intent of this thread is all about or not. What makes this more difficult is there is no way to know if a profile was a studio profile or a DA profile with a cabinet added and/or merged.
My new mics came in so I am going back to full profiles for a while.