I think I was only recently reading how O'Neill did want some of his unfinished works destroyed (not Long Day's Journey). Or that he destroyed a lot near the end of his life...?
It's nice that Albee left a little wiggle room for his executors...but I can certainly understand his concern. Half-drafts paraded under the auteur-ial hand of the latest "hot" directors, distorting what Albee might've really been going for. Horrors.