In reality the hexes and the group cap don't even matter if you can get used to playing without hexes and continuously practice playing without hexes. There can still be these mega gangs without hexes just have to keep good map awareness. With the right talents you can see all gang members on your map, though we as civilians don't have hexes we can use the map to make sure there are no friendlies we are targeting. The hexes just makes things easier, a lot easier I suppose.
This is just my opinion of course.