a direct power chord would mean having to make different models for different countries voltages. Using the "brick" technology power adapter allows Yamaha to make just one model for any country and the adapter adjusts automatically for anywhere in the world.
Today's adaptors are a big improvement over the old "wall warts" by having their "brick" in the middle. The old wall warts also usually took up a lot more space on a power strip.
The adaptors with newer MOTL arrangers are also much lighter...the one with my recent demo PSR-S910 was very lightweight, and actually, in my opinion, no more inconvenient to use than a regular power cord due to the transformer part being in the middle.
I still have a tough old Yamaha PA-6 (2 amps), also not wall wart type, which I use for my equally tough and old Yamaha CS-01 mono synth, and it is pretty heavy, and definitely earns the word "brick" description.
Ian
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