IMHO (engineering), this is far more about aesthetic and fashion than about action strength. I am unaware of any stress issues around the barrel to frame joints. If the barrel lugs are circle jointed to the frame, the bulk of the load in firing is straight tinsel on the frame and compression on the lug; both in relatively thick section areas. I don't see any particular strength advantage for either design or the need for any. Note that this is not an area in which even low quality guns fail.

DDA