As to not seeing arrangers around in "real" bands:

You'll see arrangers in use in many professional settings such as Cruise ships, dance bands and high energy singles who entertain in settings where a larger band just wont fit, or would be too loud. If a B3 player can be called "legit" because he's using bass pedals, then a good, solid arranger can be used to fill in whats missing in any other situation. It's all about changing with the times. I am still playing my butt off with both hand, both feet and my voice ... the arranger does it's thing, and I do mine ... same as when I was in bands.

Touring acts use tracks, sequences, automation, and anything else to make the show. Please don't suggest that the business is just for manual labor. Automation makes it possible for us to communicate on this site - embrace the technology.