What's wrong with it there? That's where MOST keyboards have it. At least you can't lay a music book down on your arranger and it accidentally switches off...

Mind you, the unprotected USB stick port, right next to the end of the keyboard looks like a really bad idea. One over enthusiastic organ smear up the keyboard, and your precious stick drive, and the connector could be toast. Take a look at the GW-8 to see how it SHOULD be done... a recessed, protected, covered USB port.

Yamaha CAN get it wrong, at times...