I have a different take coming from the New York, US market.

I think the US music scene, for the most part, is much more "edgy" and "grittier" than the rest of the world. We lead the music world in Hip Hop, Rap, Alternative (to some degree) and other genres. An arranger keyboard can't keep up with these types of music styles and thus musicians here lean more towards workstations which provide more of a creative pallette then an arranger which sort of forces you into "pigeon holed" types and styles of music.

Just my 50 cent....

Al