I believe that good musicians today are equally strong in this respect as they were then, the main difference being that most of them today aren't into sacred polyphony; or at least only among many many other things... which gives you a negative selection bias.Is it possible that the aural culture was so strong in the day that, hearing a part was adequate for learning it well? (Our own time clearly doesn't pass things on in this way, but in his day, maybe?)
Two thirds of the singers of my choirs even cannot read music at all... last week one of them (40+ years of membership) asked me what the C after the clef meant...
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