Let's modify Gary's (my true buddy)anagogy with the car, but instead of the steering wheel..... lets say that Ford decided to put the brake pedal more to the left than usual. That's more in line with the way I see it.
You reach for the pedal to stop the car, and "oops" you need to check first, and make sure your foot is in the new position. By that time it's too late.

This actually is a very important issue, and I'm sorry Steve, I can't promise that more people will buy your kb's with better keys, but I CAN promise that I WILL buy (and promote) more of them if you do.

Maybe this is one big reason that more pros seem to look down on arrangers in general. They play one for 15 seconds...fell uneasy and cheated and make a snap decision that the rest of the instrument must be substandard as well.
Full size should mean FULL SIZE. End of story. I don't care if you sell a trillion at the smaller size ... you'll sell the SAME ammount to those buyers and you'll probably pick up a whole lot more pros in the process.
Think about it. Why DON'T you see Tyros on MTV?