Point well made about the etheric power of a live performance. I have stayed in a concert where Ligeti was being played, to my own surprise. Any more thoughts on this?

As for super strength vibrato, I understand that it is thought to be required for being heard over a large orchestra? Possibly more necessary for high voices to carry? As a non-vibratorial soprano I have tried harmonising with a male guitar busker and similar public performances in non-concert hall type spaces and been told people simply can't hear me. No, I dislike it too, especially in its more robust manifestations.