You'll find that in most recording studios worth their salt all machinery is in a machine room away from the control room. The mixing desk is the only piece of kit in the control room, and nowadays most of those are virtual anyway.

Therefore isolation only really needs to be a large rack next door.

And as an ex-physical chemist I find cable directionality in what is effectively a plain bit of copper or silver wire to be a jolly jape to extract a few more pennies from gullible audiophiles - also adds to that mystique to keep non-hifi folk out..