First of all, I hope you didn't think I was talking about you! You are always very generous and thoughtful.
I still don't agree with your claim though :). I suppose if a writer is alive and wants to exercise total control over his or her work, then they have the right. But knowing the extreme lengths that writers like Beckett and Albee went to to preserve the purity of their original construct has always troubled me. Albee used to claim casting approval for every production of VIRGINIA WOOLF and it made doing that play an unnecessarily massive headache for a lot of theatres.
And presumably the Robbins, Laurents and Bernstein Estates (not to mention Mr. Sondheim) all gave their okays on the changes?
The European Theatre is, of course, a director's theatre and I am very glad to have seen some radical reinterpretations of classic plays. I generally come out thinking how brilliant the original was!