In short, Rosbone's graphic makes sense because of the balance of the maps, not because people want to camp with MG's and mortars.
The couple new maps like White Ball are really good, but my guess is that the few people that make maps have to put in hundreds of hours to make a map play like that.
I like everything you said in your post. And appreciate your comments on all the maps!
The weird thing with making a 4v4 map is that it is the easiest to make. The area around the fuels needs to be balanced. The middle VP needs to be pretty open, but not too open for ELE/JAGD. And dont put a lot of sight blockers between the base and the fuel. So the middle 128 meters is all the really matters.
The problem is getting the map tested and Relic limiting us to how often we can add maps. So you only get one shot at it. You cant make any crazy interesting maps like Lorch. Because it may be the only map added for 2 or 3 years. So you have to make it a little boring and generic so it plays best for everyone.
And testing a 4v4 map is extremely hard for balance. Getting 8 players with the same skill set to play is impossible. So it is almost not needed. It is good to find the big bugs and see how players 'feel' the map though.
MY ACTUAL POINT
Anyone can crank out a 4v4 map in a week or two if it is not too complicated. We have a lot of new mappers that are cutting their teeth on 1v1 and 2v2 maps right now. It would be great to see them make some 3v3 and 4v4 maps if we ever get a hint from Relic about another map patch.
And of course my constant broken record line I always use "WE NEED A MAP MAKING CONTEST". Maybe not make it super huge like the 2v2. Just something small but big enough to get some players interested in playing the maps for testing.