Hi Diki
You have missed what SA2 and Tyros 3 is all about.
SA2 does automatically what previously you had to use the Wheels etc for, thus minimising there use and allowing the player to do other things. (If you look at the demos you will see the wheels are seldom used, as the onboard computer works it out for you)

As to the chord sequencer, then modern chord/note recognition systems make this virtually redundant, as no matter how you play, the backing will always be musical.

The Tyros 3 really does take easy play to a whole new level, (Thus cementing it like all arrangers for the home user) and pros will have no problem using the extra facilities, for the simple reason that they are pros.(Many home users will also have no problem using the extra facilities)

Bill