A famous early music singer's recording will create hundred of singers with exactly the same voice, the same ways, the same vices, - imitation always being less. Perfection is no issue for the interpretation of Glenn Gould. And it is not a matter of comparing of giving quality degrees. If only singers would have the guts to sing early music their own way, not the one of the instrumentalist director's, and to let their singing be led by the moment as well, and not by musicological insight. They should learn about the magical power of words and not lean on the translated meaning.
Anachronism destroys any live performance.
The early music singer has to find out how words have a power of their own, a magic of their own. Being totally involved with text, making music through one's own personal distinguished voice not necessarily formed by a famous singing teacher, performing like some in pop and rock scene, even though a toll and a risk is involved, I think would be worthwhile.