I actually remember wanting to see TOYS IN THE ATTIC as a kid, but to my knowledge and memory, it never happened.
And what BK describes has happened on other plays-to-films: the shortening, the adding of material, and yet the brilliance in casting or directing or photography, or hopefully all three.
So what you wind up with is two separate great works that you wish could have somehow been combined. Does that make any sense? I'm still on my first cup of coffee, and I'm already ready for
More coffee!