I agree. When I tried to explain this before no one got it!
Without the secondary plates in then you have more than twice the diameter and the thottlebody once again becomes the restrictor, so your bottom end will SUCK with an even bigger TB when they are deleted.
I run the big 70mm TB baby
...with secondaries left in just for this reason. I don't suffer any low rpm driveability or powerloss from it and I get pretty much instant throttle response. Anything above 3000 rpm and I'm pushing positive pressure from the turbo so I don't notice any issues with it.
