Gasket matching vs. port matching.

I"ve asked this question to a couple of people and they don't seem to understand what I'm trying to say.
We've all seen or are engine builders that gasket match intake runners to cylinder head ports.
The intent is to make a seamless transition from the intake to the heads.
No step. Got that.
However, the intake gasket is always larger than the blueprint dimension of the intake port by design. I was told by one manufacturer their spec. is .030" larger all around for the gasket. Many times I've seen .060" excess gasket border dimension on SBM engines. So when you grind away the port to the gasket size; you are taking the intake port cross section area, only at the mating surface, way beyond it's blueprint dimension.
I was told this really doesn't affect flow. Maybe so. But, why do it if your intent is to blueprint (or close as you can).
There is an aluminum intake for sale here on FABO and apparently someone has gasket matched the ports. You can see the expansion of cross section area in the pictures. Really got me thinking about this.