The main aim of theatre is to capture the attention of the audience and focus their perception solely on the performance.
A Theatre Director may wish to create an illusion so real, that theatregoers are completely unaware of any audio equipment present and the sound they perceive is natural, believable and all consuming.
Sound plays an important part in this illusion. Competent sound designers may wish to track an actor across the stage using delays to enhance this effect, however unless the reproduction is accurate and real, the potential of this magic cannot be achieved.
If you have high expectations of the equipment you choose to use, why not visit a theatre near you that is using an OPUS system.