I think an arranger is as much a "lazy man's tool" as a snow blower is to a shovel !!! ... If it makes a musician's life easier to deliver the final product, that's great IMHO ...

PS... when it comes to a snow blower or a shovel, I take it a step further and pay someone else to do it ! ... but the KB, I play myself ...
in fact I will be doing that today while the plow guy takes care of the drive way ... another 8" to 12" expected on top to the 16' we had last week ... and MORE TO COME ON THURSDAY !!!