Agreed, but anyone who has removed an LCA and witnessed first hand the loose socket and studied the design and lack of bracing underneath and witnessed how much better the LCA operated after being clamped and the plates welded on, anyone that has any ounce of logical engineering deduction (and that could come from working in other fields, even building Lego as a kid etc), anyone who's not argumentative for the sake of it (like your man j-c-c), they would generally all agree the plates are a good idea.
As.for the thickness of the plates, the above again applies. They need to thick enough to weld, thick enough in comparison to the subject matter. You get a feel for these things, and don't need a computer or complex data to work it out. There will be an optimal thickness but "home engineering" will get you close enough.
Questions for j-c-c:
1. If the original design is perfect why do they sockets become loose over time? Was this intentional by design?
2. If you remove the LCAs on your own car to replace the LCA bushing and the sockets are loose, will you simply re-install without attempting to fix?