Speakers on top of subwoofer

I think ignoring the fact that the woofers INSIDE the Harbeths actually woof renders objections to putting them on subs ridiculous. 

“Are those the 40.3 XDs?”   Yes. Paired with an Accuphase E800.  

If you're not using 4x subs in a dsp bass-managed array, what are you even doing with your life? (I kid, but seriously, if I didn't get the science of it I'd think it was witchery.)

@soix  What exactly is the "design change' allowing the Wilsons to have the speaker on top of the sub cabinet?

Maybe as @steakster points out... Wilson uses The new V-Material, which is used where two parts of the cabinet come together, "behaves like a vibration absorber," according to Wilson.

You can add a world class 'vibration absorber' on the Harbeth/subwoofer also!  Vibration absorption is not exclusive to just Wilson audio. Easily measured also.

'the best place to put subs for optimal bass in a room is pretty much never where the speakers are placed'

Then, according to this statement, you can conclude that the Wilsons can "never" be correct. Since the speakers are always connected to the subs and according to you, they shouldn't be.

Another thought is that subwoofers and speakers are different sizes, so placing your speakers on top of your subwoofers might make them too high or too low for proper listening.

FWIW, I would never put my speakers on my Sub.😀