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FYI - ACC has a similar radiator cover made out of 304 stainless steel. They also have additional dress up items that compliment the radiator cover.
ACC Chrome Radiator Cover cover
The stock shroud funnels air to the fan opening. Without it the fan would pull air through a small portion of the radiator instead of the whole thing. It's still about air flow, and with a walled-off radiator you don't have any air flowing anywhere. It's like holding your hand out the window at 60 mph.
Once our weather is solidly in the 90s I'll bet it's going to run hot.
maybe you miss understand everything stock is staying there....the fan shroud,coolant and washer jugs everything this piece is just to cover it up not replace it......air flow will be the same as it is now.. hell it got to 92* today.