My belief about the Wagnerian and Verdian voice myth is that, with the loss of bel canto schooling, singers lost the ability to sing dramatically from vocal balance – they lost sight of the truly mixed voice. The mistake that is still made is the assumption that to sing the works of these composers you not only need a large voice (which of itself is fair enough) but you have to use it in a ‘beefy’ or overcharged manner. No voice, however big, responds kindly to such treatment. The results have been disastrous for the music and most of its exponents alike.
Harrison, Peter T. Singing: Personal and performance values in training. Dunedin Academic Press Ltd. 2013.