Unless your an top AMA pro rider I doubt you'll ever put enough cornering force to flex the swingarm. A really good hit from a pot hole on the street may not even flex it.
Flex is not always a bad thing, Some top GP and AMA riders like flex in the frame or swingarm. If the frame and swingarm are too stiff it will either just break in 2 pieces or cause the bike to loose traction, neither of these is good, so flex is not bad after all.
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Team Pro-Motion Safety Director/Coach #23