Blanking the EGR would prevent the sooty exhaust gases from getting in there so yes it would stay alot cleaner. The issue is whether your ECU would register an error code due to the blanked off EGR.
I used to have a BMW 330D that I blanked off the EGr and I had no issues with error codes, but that is of course a completely different car.
If you consider cleaning it as a yearly service regimen then you could probably skip blanking it and stay on top of the gunge build up.
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