You are missing nothing !
It is a simple way of effecting EGR removal and cost nowt...

If a blank or a hollowed out EGR is fitted it improves the air flow. Whether it is noticeable is difficult to answer
 
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Possibly. Mine was not stuck open though.

That's exactly what I did.
Me too
For sure, when I cleaned my inlet manifold and EGR (latter wasnt too bad though) it made a heck of a difference
I also thought the reason for getting clogged up could be the sump breather filter being blocked?
 

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