But the crucial difference is that both my comment and your reply (by and large) did at least make sense,

Perhaps according to structure, yes but does

"anyone who sings can hear that he can sing, and probably has just as "big a voice" as the next successful professional mainstream singer who makes a living out of his vocal chords.

mean that someone stating,

"Mr Buble is a crooner not a singer - ie he needs a mike near his gob to make the voice work"

can not sing?