At the time, I was a director/accompanist at a small church with a choir of about 20 people. I found I could direct most things from the piano just fine and I think it helped the choir take more responsibility for their music-making. But, I realize this was a unique situation. There are always rewards and challenges with the job - that goes without saying. And in a larger church with a larger choir doing more difficult music, I can see how the role of director/accompanist would be more challenging and could in fact limit what the choir is able to do.