SK did the same thing....6/12 point. The way I figure it, the smaller sizes ARE more prone to rounding off the nut (when using 12pt), and 6pt wins every time in my book.
Looking at my Thorsen combo wrench set, those smaller sizes are 6pt, and are 12pt on the box end.
Then again, PROTO might think they know something when I have 3/8 drive sockets in 12pt down to 5/16" sizing.