It would be interesting to hear how people on both sides of this discussion define “arranger”.
It seems as if we have two (or may be more) type of arranger users.
The ones who support and understand open arrangers use styles the way most Yamaha users use their styles. They use third party styles, the change sounds of individual parts of styles, they copy parts from one style and put them in another to create a new style …. I think in Yamaha terms they call it style assembly.

On the other side however, those who do not understand and do not see the use of open arranger are still stuck on the close arranger concept and use an arranger with just the OOTB styles and sounds. The Audya would be the perfect arranger for them where there is not style creation and the editing is limited.