The other thing to consider is that it's not always a case of one function per channel. I often use one channel for each flap to give me the extra flexibility for trimming. Same deal with dual elevator servos. Sure you can use a JR Multibox or similar but its just another piece of kit to worry about.

After 4 years with a DX7 (which replaced a JR388 8 channel) I just upgraded to a JR 9 channel 2.4Ghz and I love it!

Terry