Minn Flyer!
I agree that in order to fly an aircraft, one doesn't need more than 4 channels (in fact only 1 channel was needed in the old days when rudder only was the norm), BUT things get so much easier if more channels are available.
Since when is two simpler than one?
This will become obvious when you try to set up an aircraft with barn door ailerons instead of simple strip ailerons. Also, it will become obvious when you realise that some aileron differential would come in handy in order to make that pattern aircraft roll straight or when you want to reduce the skidding tendencies of that Cub. It probably takes less than 30 seconds to dial in some aileron differential with a modern computer radio, using two aileron servos.
Again, how can you possibly say that having two servos is easier than a "U" coupler, or a single forked pushrod? And even if you DID need two Elevator servos, there are a myriad of ways to do it without an extra channel.
Sure, but I find a U-coupler a less than satisfactory solution unless it is very stiff, especially for faster aircraft or aircraft with large elevators.
Have you ever tried rocking the elevators of an aircraft with an Y-fork pusrod in opposite directions. Nine times out of ten you get a lot of movement unless special precautions have been taken.
BTW, I agree with you that some radio manufacturers should get their act together and produce nice and intuitive user interfaces and manuals that ordinary people (like me) can understand. When there is a market for third party manuals, the software designers have obviously not done their job right.
/Red B.