Saying you prefer it when people "Sing out" isn't the same as saying you want them to adopt the tricks and techniques of classical singers.

In fact for the opposite sort of reason, very awful classically trained singers are remarkably hard to understand, because of a tendency to distort the vowels to give a fuller sound.

I was listening to a CD of Dave Goulder singing some songs from the modern classical repertoire (Ivor Gurney for example), but in the clear and easy voice of a folk singer - and recognising that these songs were actually good songs, and I could understand them. But by and large they don't sound that way from classical concert singers.

Both types of distortion come from performers and record producers who are more concerned with the sound than with the meaning. Unfortunately the type of distortion that is often associated with pop music tends to feed over into the way ordinary people assume singing should be done, and they do it that way.