I have run across a number of "real" players that, believe it or not, just do not know anything about arranger keyboards. One of them played trumpet for Skitch Henderson when he was a young man. And while he is a veteran (older) player now, he still does gigs in the Miami-Dade area of Florida.
He tried his hand at singles several years ago with a keyboard and drum machine and played the keys in several combo groups. He became disenchanted and went back to trumpet exclusively.
He was a guest at a banquet I played in December. He was blown away by what I was able to do with the PSR 3K...and stayed after the gig to learn more about it.
All this is just to say...not all real musicians share the common knowledge about arrangers that we here on the Zone do.
Eddie