Stiffer is always better.
Anyway, never say never. I guess the OEM steel-reinforced rubber gaskets were all installed incorrectly at the factory then because they're blowing left and right. It's an awful design. Cheaper and faster to make, but badly flawed. Even the car magazine guys did a low buck repair using two of the OEM metal plates for added rigidity. However, the intake manifold is not steel. Aluminum, I believe. Clamping a steel plate to an aluminum manifold, where the heat and constant vacuum dynamics of an engine are present is just begging for problems. Every heat cycle sets up a stress on the gasket since steel and aluminum expand and contract at different rates. Over time it adds up. The thick aluminum plate makes sense. The stocker will last.....if you drive like pawpaw. Actually, my preferred method of fixing the problem is ditching the keg altogether, but that costs considerably more.