The play in question was flawed in two major ways. Primarily a two-hander, the narrative was supported by three minor characters. Nothing wrong with this particularly, but in terms of casting - would actors be interested in such small roles?
The second flaw was in the scene breakdown with the two main characters. The play progressed over many years and both characters had to change their appearance to mark the passing of time. This meant that the scene changes ran the risk of slowing up the pace of the play.
Of course a director would recognise these hurdles and work through them and would do so with verve and inventiveness. However, my point is simple, should the writer pen a script where the narrative flow is smoother and each character earns their keep.
To end on another misquote, this time Mr Dylan: " know your song well before you start singin'.