Perhaps it matters if the TV is standing too proud off the wall. Mine is a good 14" off the wall. The soundstage is definitely deeper without it. Of course with the TV, you can never add a diffuser like Trevor did. He added a diffuser, his wife had a rapture and that's the last we heard of it.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated