I think a lot of the disagreement regarding the MS being marketed on this forum and the usefulness of open keyboards stems from persons not able to articulate “what is an arranger”.
I have posted topics on what is an arranger (or words to that effect) but no one really answered the question.

More importantly is the “arranger” an evolving concept or does it stay as one way of making music.

Notice I am not asking what is a good arranger, but I am only asking the basic of questions that is what does a keyboard have to have in order to be able to be call an arranger.

Is an arranger an ends or a means.