My guitarist writes, and we have performed a few originals, and are working on some more, but we don't do an entire show, yet. But we are working on a new album, and I hope some of them get into the act. Might be fun to do a few promotional shows!
Last full band I was full time with (and me and my guitarist are both from that) did whole shows of originals occasionally (when we had a new CD, usually!).
I back a few young songwriters, from time to time, and there we'll do all original. It isn't usually good money, but the opportunity to be creative and help shape something new is well worth it...
I use my arranger to try and play with MORE people, not less!
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An arranger is just a tool. What matters is what you build with it..!