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@qckpckt
It's not a design flaw. That's why saddle rails have a little guide on the side to show you the clamp area, like so:
Mounting the saddle outside of that area subjects the saddle to forces beyond the design parameters due to the effect of placing weight either too far fore or aft.
It would be a design flaw if they said you could mount it anywhere, but they don't for this very reason.