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I have nothing at all against it, in principle. In the end, the result counts, not how it was achieved. If electronic assistance is needed, fine, use it.
I think however, that it should be very consciously applied. Just making certain singers/instruments loud can have weird effects if it's done without consideration. For example the heard volume of a singer just might not fit to the kind of sound she or he is producing anymore, making it sound highly unnatural and reducing the identification between the singer and his heard voice. (I.e. singing loudly isn't just louder than singing quietly, it also gives a different tone. And if you just make something that is sung quietly too loud, it will immediately give an "amplification impression" which can be distracting.) The other problem is spatial positioning of the amplified sound. Since the majority of the sound is not coming from the actual position of the singer anymore, but from speakers, there is a loss of spatial information and all voices are brought together to a single place, taking away some of the room experience of the opera stage and making it more flat. Clever positioning of the speakers and being careful of how much of which signal you send to which speaker (or even more advanced stereo/surround-techniques) can help with that.
In most cases, all of these things are not a problem when the amplification isn't too strong, i.e. if the real sound still can be heard and it's not -only- coming from the speakers.
I've composed for a project with Guitar, Viola and Live-Electronics recently, where we had to use amplification. It was crucial to find just the right volume of amplification, to make it loud enough to be heard enough for the whole audience, but not make it sound too detached from the stage and the actual musicians. I think that is one of the crucial points: As soon as the amplification becomes so strong that you're no longer hearing the music as a direct result from the music on stage, but just as "loudspeaker music with people moving around on the stage" you probably should use less amplification, since at this point you might just as well record the musicians/singers and not use them live at all, which would be a lot cheaper. If you -do- use live musicians, don't make them appear totally obsolete.
But of course, one basic thing should also be: Build opera houses with good acoustics!
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