A demonstrator at my bonsai club said that cascade bonsai should NOT have a
forked tail at the end. I was too interested in watching the design at hand
that I failed to ask why.

It would look like the devil.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)