Perhaps this is too simplified, but I have been playing arrangers for over thirty years. I use them in shows three times a week now, but, in the early days I found them necessary for home use, as it was so gratifying to have anything from drums and bass, to a full band behind me. I am speaking from the stand point of a solo player.

If you are playing with others that provide provide backing, or you are recording tracks e.g., then I might use a non-arranger.

Personally, I think you are missing out on a lot of enjoyment by not having an arranger.

Bernie