I can't agree with those generalizations, in fact my blood pressure goes up whenever I see them repeated as fact. Off-axis response to my ears is perfect, sibilance totally depends on the source (crap in=crap out) and how much bass is actually mixed for a center channel? Plus most people have their centers set to small.
My opinion only, I'm sure devoted listeners of pink noise will disagree
I think I'll add I have 60's and QS8s to go along with the VP150. And...... the best way to tell; is to let your ears decide.