I'm thinking we're putting too much faith in "tech".
Technical problems plagued Daniel Craig and Rachel Weisz’s Broadway revival of Harold Pinter’s “Betrayal,” forcing the cast to bravely battle on without mechanized set changes... "By 9:30 p.m., they had only got through a few more scenes, and — while the actors made a valiant attempt to continue — some in the audience became restless and left.”